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Glossary
What is a Chess Problem?
Phases of Play
Three-movers
More-movers
Helpmates
Longer Helpmates
Grimshaw
Battery Play
Allumwandlung
Half-pin
Echo
Bristol
Zagoruiko
Knight-wheel
Promotion Play – Part 1
Promotion Play – Part 2
Mate Transference
Square Strategy
Line Strategy
Tempo Play
Paradox
Classics
Proof Games – Part 1
Proof Games – Part 2
Selfmates
Series-movers
Problemists
Geoff Foster
Dennis K Hale
Solutions to D K Hale’s Problems
Molham Hassan
Bob Meadley
Andy Sag
Denis Saunders
Ian Shanahan
Arthur Willmott
Peter Wong
Walkabout
Walkabout 2023
‘FIDE Album 2016-2018’
‘Uri Avner: Close Encounters with the Chess Pieces’
Walkabout 2022
Judit Polgar’s Chess Artistry Competition videos
Ian Shanahan materials
Capture cycles in proof games
Blindfold chess scenes in movies and TV shows
Deciphering a complex selfmate
The Allumwandlung theme in endgame studies
Illegal clusters
Chess problem composers famous or distinguished in other fields
The Valladao Task – Part 1
The Valladao Task – Part 2
Walkabout 2021
‘Joseph Wainwright: 500+ Chess Problems’
Shortest games to stalemate and ‘Mr. Robot’ chess scene
Three-fold change of Pronkin piece in proof games
Eight-piece tablebases – a progress update and some results
Names of some Indonesian composers
‘British Chess Problem Society Centenary Review 1918-2018’
Chess problems vs puzzles and more on ‘The Queen’s Gambit’ scene
A tribute to Ian Shanahan (1962-2021)
Understanding soundness and motivations in chess puzzles, problems, and stu
Superpins – What if pinned pieces don’t check?
Walkabout 2020
Christmas problem-solving competition – solutions and results
Whyatt Medal winner: Dennis K. Hale
OzProblems site major upgrade
Special conventions in retro-analytical problems
If a pawn could “promote” to a pawn… – Part 2
Chess scenes in the Marvel films
Two problems by Karel Hursky
Chess problem scene in ‘The Queen’s Gambit’
‘Anything but Average’ by Werner Keym
Australian problems in early ‘FIDE Albums’
Walkabout 2019
Top 10 greatest chess scenes in movies
Stockfish and another modern classic more-mover
‘Alexandre’s 2020 and American Chess Nuts’
Vladimir Nabokov in ‘The Problemist’
Circe: A fairy chess condition
‘Problem World’ introduction to selfmates
A tribute to Pal Benko (1928-2019)
A heraldic endgame-tablebase composition
Modern themes rendered in pre-modern times
Christmas problem-solving competition
Walkabout 2018
New digital subscription for ‘The Problemist’
Stockfish and a modern classic more-mover
‘Esling’s Memories Expanded’ and ‘Ken Fraser – A Quiet Achiever’
The greatest masters of both the game and problems – Part 1
The greatest masters of both the game and problems – Part 2
‘Chess Problems Out of the Box’ by Werner Keym
Adventures with endgame tablebases
More adventures with endgame tablebases
Carlsen-Caruana WCC Game 6 – missed forced-mate sequence
Even more adventures with endgame tablebases
Walkabout 2017
Two selfmates by Laimons Mangalis
‘J. K. Heydon: Problemist, Solicitor, Businessman’
Norman Macleod Award winner and cyclic shift
‘Gordon Stuart Green: A Brilliant All-Rounder’ and ‘Some Mosely Material’
A tribute to Raymond Smullyan (1919-2017)
Kamikaze Chess
Weekly Problems and Walkabout archives
The le Grand theme – Part 1
The le Grand theme – Part 2
If a pawn could “promote” to a pawn…
Walkabout 2016
Whyatt Medal winner: Ian Shanahan
‘Problem Potpourri’ columns from ‘Australasian Chess’
Guided Chess Problem Composing Competition 2016 – results
‘Chess Problems by Dr. Ian Shanahan’ and other updates
‘Australian Chess Problems and News in Overseas Journals’
‘The Chess Amateur, P.H. Williams and Australia’ and ‘ACR’ update
‘Alexander Goldstein: His Life, His Chess Problems’
Improving a fairy helpstalemate – Part 1
Improving a fairy helpstalemate – Part 2
‘Laimons Mangalis: Lover of Chess’
Walkabout 2015
Guided Chess Problem Composing Competition 2015 – results
Papers on Ravenscroft, Hawes, Watson, and Tate, and GCPCC Report
Australian Junior Chess Problem-Solving Championship 2015
‘Australian Chess Problem History’ and ‘Chess Problems Made Easy’
Corrections to ‘Chess Problems Made Easy’
APwin, Virtual Pieces and other updates
The Grasshopper and the Nightrider
Changes to Problems of the Week
Guided Chess Problem Composing Competition 2016
Oz Archives files digitalised and APWin update
Walkabout 2014
‘Problem Potpourri’ draws to a close, and two selections
Australian Junior Chess Problem-Solving Championship 2014
‘The Original Christopher Reeves’
First prize problem by Geoff Foster and Ian Shanahan
Solving a four-move directmate, and the ‘Check!’ magazine
Molham Hassan profile and Oz Archives update
“Open problems” in proof games
Composing event in the Australian Junior Chess Championships 2015
Helpmates of the ‘distant’ future – Part 1
Helpmates of the ‘distant’ future – Part 2
Walkabout 2013
Two selections from ‘Problem Potpourri’
A “Holy Grail” of proof games attained
‘Minimalkunst im Schach’ edited by Ebert, Reich, and Kuhlmann
A tribute to Dan Meinking (1960–2012)
Australian Junior Chess Problem-Solving Championship 2013
Two awarded compositions from ‘The Problemist’
Task and record problems – Part 1
Task and record problems – Part 2
A list of task and record problems, and a comic strip
Walkabout 2012
Whyatt Medal winner: Geoff Foster
Two helpmates from ‘Problem Potpourri’
A marvellous more-mover from the Eighties
‘Exploration in Chess Beauty’ by Andras Toth
Upgrading a PC and chess problem solving software – Part 1
Upgrading a PC and chess problem solving software – Part 2
Australian Junior Chess Problem-Solving Championship 2012
A serendipitous joint composition
‘Philosophy Looks At Chess’ and Raymond Smullyan
Improving a century-old problem and some composing resources
Walkabout 2011
Proof games with 3 solutions
‘Frank Ravenscroft and His Letters’ and other updates
Australian Junior Chess Problem-Solving Championship 2011
Two problem conventions re castling and capturing en passant
‘FIDE Album 2001-2003’
Two first-prize problems by Geoff Foster and Ian Shanahan
Alain C. White’s Australian Problem Tourney
‘Chris J. Feather – Selected Helpmates’
Alain C. White’s Australian tourney and Brian Tomson article
A prize-winning problem by Arthur Willmott
Walkabout 2010
First prize problem by Ian Shanahan, and a comic strip
Andy Sag profile and a cartoon by Tony Lurie
A helpmate by Tim Krabbé
William A. Whyatt materials
Weekly Problems
Weekly Problems 2023
Weekly Problems 2023-A
Weekly Problems 2022
Weekly Problems 2022-A
Weekly Problems 2022-B
Weekly Problems 2021
Weekly Problems 2021-A
Weekly Problems 2021-B
Weekly Problems 2020
Weekly Problems 2020-A
Weekly Problems 2020-B
Weekly Problems 2019
Weekly Problems 2019-A
Weekly Problems 2019-B
Weekly Problems 2018
Weekly Problems 2018-A
Weekly Problems 2018-B
Weekly Problems 2017
Weekly Problems 2017-A
Weekly Problems 2017-B
Weekly Problems 2016
Weekly Problems 2016-A
Weekly Problems 2016-B
Weekly Problems 2015
Weekly Problems 2015-A
Weekly Problems 2015-B
Weekly Problems 2014
Weekly Problems 2014-A
Weekly Problems 2014-B
Weekly Problems 2013
Weekly Problems 2013-A
Weekly Problems 2013-B
Weekly Problems 2012
Weekly Problems 2012-A
Weekly Problems 2012-B
Weekly Problems 2011
Weekly Problems 2011-A
Weekly Problems 2011-B
Weekly Problems 2010
Oz Archives
Magazines and Columns
Chess Problemists
Problem History
Solving and Composing Events
Glossary
Links
About
OzProblems
Home
Problem World
Glossary
What is a Chess Problem?
Phases of Play
Three-movers
More-movers
Helpmates
Longer Helpmates
Grimshaw
Battery Play
Allumwandlung
Half-pin
Echo
Bristol
Zagoruiko
Knight-wheel
Promotion Play – Part 1
Promotion Play – Part 2
Mate Transference
Square Strategy
Line Strategy
Tempo Play
Paradox
Classics
Proof Games – Part 1
Proof Games – Part 2
Selfmates
Series-movers
Problemists
Geoff Foster
Dennis K Hale
Solutions to D K Hale’s Problems
Molham Hassan
Bob Meadley
Andy Sag
Denis Saunders
Ian Shanahan
Arthur Willmott
Peter Wong
Walkabout
Walkabout 2023
‘FIDE Album 2016-2018’
‘Uri Avner: Close Encounters with the Chess Pieces’
Walkabout 2022
Judit Polgar’s Chess Artistry Competition videos
Ian Shanahan materials
Capture cycles in proof games
Blindfold chess scenes in movies and TV shows
Deciphering a complex selfmate
The Allumwandlung theme in endgame studies
Illegal clusters
Chess problem composers famous or distinguished in other fields
The Valladao Task – Part 1
The Valladao Task – Part 2
Walkabout 2021
‘Joseph Wainwright: 500+ Chess Problems’
Shortest games to stalemate and ‘Mr. Robot’ chess scene
Three-fold change of Pronkin piece in proof games
Eight-piece tablebases – a progress update and some results
Names of some Indonesian composers
‘British Chess Problem Society Centenary Review 1918-2018’
Chess problems vs puzzles and more on ‘The Queen’s Gambit’ scene
A tribute to Ian Shanahan (1962-2021)
Understanding soundness and motivations in chess puzzles, problems, and stu
Superpins – What if pinned pieces don’t check?
Walkabout 2020
Christmas problem-solving competition – solutions and results
Whyatt Medal winner: Dennis K. Hale
OzProblems site major upgrade
Special conventions in retro-analytical problems
If a pawn could “promote” to a pawn… – Part 2
Chess scenes in the Marvel films
Two problems by Karel Hursky
Chess problem scene in ‘The Queen’s Gambit’
‘Anything but Average’ by Werner Keym
Australian problems in early ‘FIDE Albums’
Walkabout 2019
Top 10 greatest chess scenes in movies
Stockfish and another modern classic more-mover
‘Alexandre’s 2020 and American Chess Nuts’
Vladimir Nabokov in ‘The Problemist’
Circe: A fairy chess condition
‘Problem World’ introduction to selfmates
A tribute to Pal Benko (1928-2019)
A heraldic endgame-tablebase composition
Modern themes rendered in pre-modern times
Christmas problem-solving competition
Walkabout 2018
New digital subscription for ‘The Problemist’
Stockfish and a modern classic more-mover
‘Esling’s Memories Expanded’ and ‘Ken Fraser – A Quiet Achiever’
The greatest masters of both the game and problems – Part 1
The greatest masters of both the game and problems – Part 2
‘Chess Problems Out of the Box’ by Werner Keym
Adventures with endgame tablebases
More adventures with endgame tablebases
Carlsen-Caruana WCC Game 6 – missed forced-mate sequence
Even more adventures with endgame tablebases
Walkabout 2017
Two selfmates by Laimons Mangalis
‘J. K. Heydon: Problemist, Solicitor, Businessman’
Norman Macleod Award winner and cyclic shift
‘Gordon Stuart Green: A Brilliant All-Rounder’ and ‘Some Mosely Material’
A tribute to Raymond Smullyan (1919-2017)
Kamikaze Chess
Weekly Problems and Walkabout archives
The le Grand theme – Part 1
The le Grand theme – Part 2
If a pawn could “promote” to a pawn…
Walkabout 2016
Whyatt Medal winner: Ian Shanahan
‘Problem Potpourri’ columns from ‘Australasian Chess’
Guided Chess Problem Composing Competition 2016 – results
‘Chess Problems by Dr. Ian Shanahan’ and other updates
‘Australian Chess Problems and News in Overseas Journals’
‘The Chess Amateur, P.H. Williams and Australia’ and ‘ACR’ update
‘Alexander Goldstein: His Life, His Chess Problems’
Improving a fairy helpstalemate – Part 1
Improving a fairy helpstalemate – Part 2
‘Laimons Mangalis: Lover of Chess’
Walkabout 2015
Guided Chess Problem Composing Competition 2015 – results
Papers on Ravenscroft, Hawes, Watson, and Tate, and GCPCC Report
Australian Junior Chess Problem-Solving Championship 2015
‘Australian Chess Problem History’ and ‘Chess Problems Made Easy’
Corrections to ‘Chess Problems Made Easy’
APwin, Virtual Pieces and other updates
The Grasshopper and the Nightrider
Changes to Problems of the Week
Guided Chess Problem Composing Competition 2016
Oz Archives files digitalised and APWin update
Walkabout 2014
‘Problem Potpourri’ draws to a close, and two selections
Australian Junior Chess Problem-Solving Championship 2014
‘The Original Christopher Reeves’
First prize problem by Geoff Foster and Ian Shanahan
Solving a four-move directmate, and the ‘Check!’ magazine
Molham Hassan profile and Oz Archives update
“Open problems” in proof games
Composing event in the Australian Junior Chess Championships 2015
Helpmates of the ‘distant’ future – Part 1
Helpmates of the ‘distant’ future – Part 2
Walkabout 2013
Two selections from ‘Problem Potpourri’
A “Holy Grail” of proof games attained
‘Minimalkunst im Schach’ edited by Ebert, Reich, and Kuhlmann
A tribute to Dan Meinking (1960–2012)
Australian Junior Chess Problem-Solving Championship 2013
Two awarded compositions from ‘The Problemist’
Task and record problems – Part 1
Task and record problems – Part 2
A list of task and record problems, and a comic strip
Walkabout 2012
Whyatt Medal winner: Geoff Foster
Two helpmates from ‘Problem Potpourri’
A marvellous more-mover from the Eighties
‘Exploration in Chess Beauty’ by Andras Toth
Upgrading a PC and chess problem solving software – Part 1
Upgrading a PC and chess problem solving software – Part 2
Australian Junior Chess Problem-Solving Championship 2012
A serendipitous joint composition
‘Philosophy Looks At Chess’ and Raymond Smullyan
Improving a century-old problem and some composing resources
Walkabout 2011
Proof games with 3 solutions
‘Frank Ravenscroft and His Letters’ and other updates
Australian Junior Chess Problem-Solving Championship 2011
Two problem conventions re castling and capturing en passant
‘FIDE Album 2001-2003’
Two first-prize problems by Geoff Foster and Ian Shanahan
Alain C. White’s Australian Problem Tourney
‘Chris J. Feather – Selected Helpmates’
Alain C. White’s Australian tourney and Brian Tomson article
A prize-winning problem by Arthur Willmott
Walkabout 2010
First prize problem by Ian Shanahan, and a comic strip
Andy Sag profile and a cartoon by Tony Lurie
A helpmate by Tim Krabbé
William A. Whyatt materials
Weekly Problems
Weekly Problems 2023
Weekly Problems 2023-A
Weekly Problems 2022
Weekly Problems 2022-A
Weekly Problems 2022-B
Weekly Problems 2021
Weekly Problems 2021-A
Weekly Problems 2021-B
Weekly Problems 2020
Weekly Problems 2020-A
Weekly Problems 2020-B
Weekly Problems 2019
Weekly Problems 2019-A
Weekly Problems 2019-B
Weekly Problems 2018
Weekly Problems 2018-A
Weekly Problems 2018-B
Weekly Problems 2017
Weekly Problems 2017-A
Weekly Problems 2017-B
Weekly Problems 2016
Weekly Problems 2016-A
Weekly Problems 2016-B
Weekly Problems 2015
Weekly Problems 2015-A
Weekly Problems 2015-B
Weekly Problems 2014
Weekly Problems 2014-A
Weekly Problems 2014-B
Weekly Problems 2013
Weekly Problems 2013-A
Weekly Problems 2013-B
Weekly Problems 2012
Weekly Problems 2012-A
Weekly Problems 2012-B
Weekly Problems 2011
Weekly Problems 2011-A
Weekly Problems 2011-B
Weekly Problems 2010
Oz Archives
Magazines and Columns
Chess Problemists
Problem History
Solving and Composing Events
Glossary
Links
About
More
Home
Problem World
Glossary
What is a Chess Problem?
Phases of Play
Three-movers
More-movers
Helpmates
Longer Helpmates
Grimshaw
Battery Play
Allumwandlung
Half-pin
Echo
Bristol
Zagoruiko
Knight-wheel
Promotion Play – Part 1
Promotion Play – Part 2
Mate Transference
Square Strategy
Line Strategy
Tempo Play
Paradox
Classics
Proof Games – Part 1
Proof Games – Part 2
Selfmates
Series-movers
Problemists
Geoff Foster
Dennis K Hale
Solutions to D K Hale’s Problems
Molham Hassan
Bob Meadley
Andy Sag
Denis Saunders
Ian Shanahan
Arthur Willmott
Peter Wong
Walkabout
Walkabout 2023
‘FIDE Album 2016-2018’
‘Uri Avner: Close Encounters with the Chess Pieces’
Walkabout 2022
Judit Polgar’s Chess Artistry Competition videos
Ian Shanahan materials
Capture cycles in proof games
Blindfold chess scenes in movies and TV shows
Deciphering a complex selfmate
The Allumwandlung theme in endgame studies
Illegal clusters
Chess problem composers famous or distinguished in other fields
The Valladao Task – Part 1
The Valladao Task – Part 2
Walkabout 2021
‘Joseph Wainwright: 500+ Chess Problems’
Shortest games to stalemate and ‘Mr. Robot’ chess scene
Three-fold change of Pronkin piece in proof games
Eight-piece tablebases – a progress update and some results
Names of some Indonesian composers
‘British Chess Problem Society Centenary Review 1918-2018’
Chess problems vs puzzles and more on ‘The Queen’s Gambit’ scene
A tribute to Ian Shanahan (1962-2021)
Understanding soundness and motivations in chess puzzles, problems, and stu
Superpins – What if pinned pieces don’t check?
Walkabout 2020
Christmas problem-solving competition – solutions and results
Whyatt Medal winner: Dennis K. Hale
OzProblems site major upgrade
Special conventions in retro-analytical problems
If a pawn could “promote” to a pawn… – Part 2
Chess scenes in the Marvel films
Two problems by Karel Hursky
Chess problem scene in ‘The Queen’s Gambit’
‘Anything but Average’ by Werner Keym
Australian problems in early ‘FIDE Albums’
Walkabout 2019
Top 10 greatest chess scenes in movies
Stockfish and another modern classic more-mover
‘Alexandre’s 2020 and American Chess Nuts’
Vladimir Nabokov in ‘The Problemist’
Circe: A fairy chess condition
‘Problem World’ introduction to selfmates
A tribute to Pal Benko (1928-2019)
A heraldic endgame-tablebase composition
Modern themes rendered in pre-modern times
Christmas problem-solving competition
Walkabout 2018
New digital subscription for ‘The Problemist’
Stockfish and a modern classic more-mover
‘Esling’s Memories Expanded’ and ‘Ken Fraser – A Quiet Achiever’
The greatest masters of both the game and problems – Part 1
The greatest masters of both the game and problems – Part 2
‘Chess Problems Out of the Box’ by Werner Keym
Adventures with endgame tablebases
More adventures with endgame tablebases
Carlsen-Caruana WCC Game 6 – missed forced-mate sequence
Even more adventures with endgame tablebases
Walkabout 2017
Two selfmates by Laimons Mangalis
‘J. K. Heydon: Problemist, Solicitor, Businessman’
Norman Macleod Award winner and cyclic shift
‘Gordon Stuart Green: A Brilliant All-Rounder’ and ‘Some Mosely Material’
A tribute to Raymond Smullyan (1919-2017)
Kamikaze Chess
Weekly Problems and Walkabout archives
The le Grand theme – Part 1
The le Grand theme – Part 2
If a pawn could “promote” to a pawn…
Walkabout 2016
Whyatt Medal winner: Ian Shanahan
‘Problem Potpourri’ columns from ‘Australasian Chess’
Guided Chess Problem Composing Competition 2016 – results
‘Chess Problems by Dr. Ian Shanahan’ and other updates
‘Australian Chess Problems and News in Overseas Journals’
‘The Chess Amateur, P.H. Williams and Australia’ and ‘ACR’ update
‘Alexander Goldstein: His Life, His Chess Problems’
Improving a fairy helpstalemate – Part 1
Improving a fairy helpstalemate – Part 2
‘Laimons Mangalis: Lover of Chess’
Walkabout 2015
Guided Chess Problem Composing Competition 2015 – results
Papers on Ravenscroft, Hawes, Watson, and Tate, and GCPCC Report
Australian Junior Chess Problem-Solving Championship 2015
‘Australian Chess Problem History’ and ‘Chess Problems Made Easy’
Corrections to ‘Chess Problems Made Easy’
APwin, Virtual Pieces and other updates
The Grasshopper and the Nightrider
Changes to Problems of the Week
Guided Chess Problem Composing Competition 2016
Oz Archives files digitalised and APWin update
Walkabout 2014
‘Problem Potpourri’ draws to a close, and two selections
Australian Junior Chess Problem-Solving Championship 2014
‘The Original Christopher Reeves’
First prize problem by Geoff Foster and Ian Shanahan
Solving a four-move directmate, and the ‘Check!’ magazine
Molham Hassan profile and Oz Archives update
“Open problems” in proof games
Composing event in the Australian Junior Chess Championships 2015
Helpmates of the ‘distant’ future – Part 1
Helpmates of the ‘distant’ future – Part 2
Walkabout 2013
Two selections from ‘Problem Potpourri’
A “Holy Grail” of proof games attained
‘Minimalkunst im Schach’ edited by Ebert, Reich, and Kuhlmann
A tribute to Dan Meinking (1960–2012)
Australian Junior Chess Problem-Solving Championship 2013
Two awarded compositions from ‘The Problemist’
Task and record problems – Part 1
Task and record problems – Part 2
A list of task and record problems, and a comic strip
Walkabout 2012
Whyatt Medal winner: Geoff Foster
Two helpmates from ‘Problem Potpourri’
A marvellous more-mover from the Eighties
‘Exploration in Chess Beauty’ by Andras Toth
Upgrading a PC and chess problem solving software – Part 1
Upgrading a PC and chess problem solving software – Part 2
Australian Junior Chess Problem-Solving Championship 2012
A serendipitous joint composition
‘Philosophy Looks At Chess’ and Raymond Smullyan
Improving a century-old problem and some composing resources
Walkabout 2011
Proof games with 3 solutions
‘Frank Ravenscroft and His Letters’ and other updates
Australian Junior Chess Problem-Solving Championship 2011
Two problem conventions re castling and capturing en passant
‘FIDE Album 2001-2003’
Two first-prize problems by Geoff Foster and Ian Shanahan
Alain C. White’s Australian Problem Tourney
‘Chris J. Feather – Selected Helpmates’
Alain C. White’s Australian tourney and Brian Tomson article
A prize-winning problem by Arthur Willmott
Walkabout 2010
First prize problem by Ian Shanahan, and a comic strip
Andy Sag profile and a cartoon by Tony Lurie
A helpmate by Tim Krabbé
William A. Whyatt materials
Weekly Problems
Weekly Problems 2023
Weekly Problems 2023-A
Weekly Problems 2022
Weekly Problems 2022-A
Weekly Problems 2022-B
Weekly Problems 2021
Weekly Problems 2021-A
Weekly Problems 2021-B
Weekly Problems 2020
Weekly Problems 2020-A
Weekly Problems 2020-B
Weekly Problems 2019
Weekly Problems 2019-A
Weekly Problems 2019-B
Weekly Problems 2018
Weekly Problems 2018-A
Weekly Problems 2018-B
Weekly Problems 2017
Weekly Problems 2017-A
Weekly Problems 2017-B
Weekly Problems 2016
Weekly Problems 2016-A
Weekly Problems 2016-B
Weekly Problems 2015
Weekly Problems 2015-A
Weekly Problems 2015-B
Weekly Problems 2014
Weekly Problems 2014-A
Weekly Problems 2014-B
Weekly Problems 2013
Weekly Problems 2013-A
Weekly Problems 2013-B
Weekly Problems 2012
Weekly Problems 2012-A
Weekly Problems 2012-B
Weekly Problems 2011
Weekly Problems 2011-A
Weekly Problems 2011-B
Weekly Problems 2010
Oz Archives
Magazines and Columns
Chess Problemists
Problem History
Solving and Composing Events
Glossary
Links
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