Welcome to OzProblems.com, a site devoted to the chess problem art in Australia! Whether you’re a player who is new to composition chess or an experienced solver looking for challenging problems, we have something for you. Our aim is to promote the enjoyment of chess problems, which are at once interesting puzzles and the most artistic form of chess.
Problem of the Week
336. Percy Francis Blake Sydney Morning Herald 1911 3rd Prize 

Mate in 2 
The weekly problem’s solution will appear in the following week, when a new work is quoted.
• See last week’s problem with solution: No.335.
• See previous Problems of the Week without solutions: Page 1  2  3  4  5  ...  10  11  12  13  14.
• Comment on a problem you have solved.
• Subscribe to OzProblems updates.
• Ask about any aspect of chess problems.
Walkabout
Chess and problem rambles by PW30 Apr. 2017 – Norman Macleod Award winner and cyclic shift
The Norman Macleod Award, organised by the British Chess Problem Society, is bestowed on the most striking and original problem of any genre published in The Problemist over a twoyear period. Given its emphasis on novelty, perhaps it’s not surprising that the Award has never been won by twomovers, the most highly investigated of all genres. However, in the recently announced Award for the 201415 period, the Slovakian Grandmaster Peter Gvozdjak has managed to break the trend, by gaining first place with a brilliant twomover. His problem realises for the first time a theme described as “fourfold cyclic shift in threat form” – a complex type of changed play. Before analysing it, though, I should provide an example of a twomover showing the more standard form of cyclic shift.
A cyclic shift of mates is a kind of extension of the reciprocal change scheme. The latter involves set or try play where the defences 1…a and 1…b are answered by 2.A and 2.B respectively, but after the key, the white moves are reversed: 1…a 2.B and 1…b 2.A (examples: No.10, No.334). The two elements of play that get exchanged here – a pair of white mates – are increased to three or more elements in a cyclic shift to generate this “circular” pattern: 1…a 2.A, 1…b 2.B, 1…c 2.C in the set or try play, becoming 1…a 2.B, 1…b 2.C, 1…c 2.A in the actual play. This difficult idea, also called the Lacny theme, is accomplished very economically in the problem above. The try 1.Rh4? (waiting) prepares to attack f4 if Black moves the knight and also to pin the piece if the king takes the flight: 1…S~ [a] 2.Sh7 [A], 1…Kf4 [b] 2.Be3 [B], 1…B~ [c] 2.Qxg4 [C], but 1…Be6! defeats the try. The key 1.Rf7! (waiting) again aims for f4 but exploits the black bishop’s position instead, and the rook also covers f6 while unguarding h6. Now we see three changed variations where the same mates reappear but are shifted to other defences: 1…S~ [a] 2.Be3 [B], 1…Kf4 [b] 2.Qxg4 [C], 1…B~ [c] 2.Sh7 [A].
The Award winner demonstrates a fourfold cyclic shift as it contains a similar pattern but with four thematic defences and mates. Such a scheme is rarer but not new; what’s new is the form of that cyclic play, viz. the four mating moves are multiple threats, which are then separated or uniquely forced by the four defences. In the initial position, the g2bishop and a5rook are both controlling a potential flight on d5. Each of these linepieces is cut off in turn by the d4knight with the try 1.Sf3? and key 1.Sb5! Both knight moves create these four threats: 2.Qg8/Sxb2/Qd4/Qc3. The four thematic defences all take place on f3 and b5 – the same squares visited by the white knight – so that Black either (1) closes the remaining white line of guard to d5 or (2) captures the knight and removes its control of d4. All of these strategic effects – and more! – are designed to make each black defence foil exactly three of the four threats while leaving the fourth viable. Thus the try 1.Sf3? gives 1…Sb5 [a] 2.Qg8 [A], 1…Qxf3 [b] 2.Sxb2 [B], 1…Rb5 [c] 2.Qd4 [C], 1…Sxf3 [d] 2.Qc3 [D], but 1…Rxd1! refutes. Among the many dual avoidance effects, note for instance how 1…Sxf3 pins the d1knight and prevents 2.Sxb2. After the key 1.Sb5!, every defence remarkably stops a new triplet of threats to bring about these cyclic changes: 1…Sxb5 [a] 2.Sxb2 [B], 1…Qf3 [b] 2.Qd4 [C], 1…Rxb5 [c] 2.Qc3 [D], 1…Sf3 [d] 2.Qg8 [A]. An amazing fusion of cyclic shift, Fleck theme (separation of threats), and dual avoidance, this twomover really pushes the envelope!
Michel Caillaud The Problemist 1981 2nd Commendation 

Mate in 2 
A cyclic shift of mates is a kind of extension of the reciprocal change scheme. The latter involves set or try play where the defences 1…a and 1…b are answered by 2.A and 2.B respectively, but after the key, the white moves are reversed: 1…a 2.B and 1…b 2.A (examples: No.10, No.334). The two elements of play that get exchanged here – a pair of white mates – are increased to three or more elements in a cyclic shift to generate this “circular” pattern: 1…a 2.A, 1…b 2.B, 1…c 2.C in the set or try play, becoming 1…a 2.B, 1…b 2.C, 1…c 2.A in the actual play. This difficult idea, also called the Lacny theme, is accomplished very economically in the problem above. The try 1.Rh4? (waiting) prepares to attack f4 if Black moves the knight and also to pin the piece if the king takes the flight: 1…S~ [a] 2.Sh7 [A], 1…Kf4 [b] 2.Be3 [B], 1…B~ [c] 2.Qxg4 [C], but 1…Be6! defeats the try. The key 1.Rf7! (waiting) again aims for f4 but exploits the black bishop’s position instead, and the rook also covers f6 while unguarding h6. Now we see three changed variations where the same mates reappear but are shifted to other defences: 1…S~ [a] 2.Be3 [B], 1…Kf4 [b] 2.Qxg4 [C], 1…B~ [c] 2.Sh7 [A].
Peter Gvozdjak The Problemist 2015 Norman Macleod Award 201415 

Mate in 2 
The Award winner demonstrates a fourfold cyclic shift as it contains a similar pattern but with four thematic defences and mates. Such a scheme is rarer but not new; what’s new is the form of that cyclic play, viz. the four mating moves are multiple threats, which are then separated or uniquely forced by the four defences. In the initial position, the g2bishop and a5rook are both controlling a potential flight on d5. Each of these linepieces is cut off in turn by the d4knight with the try 1.Sf3? and key 1.Sb5! Both knight moves create these four threats: 2.Qg8/Sxb2/Qd4/Qc3. The four thematic defences all take place on f3 and b5 – the same squares visited by the white knight – so that Black either (1) closes the remaining white line of guard to d5 or (2) captures the knight and removes its control of d4. All of these strategic effects – and more! – are designed to make each black defence foil exactly three of the four threats while leaving the fourth viable. Thus the try 1.Sf3? gives 1…Sb5 [a] 2.Qg8 [A], 1…Qxf3 [b] 2.Sxb2 [B], 1…Rb5 [c] 2.Qd4 [C], 1…Sxf3 [d] 2.Qc3 [D], but 1…Rxd1! refutes. Among the many dual avoidance effects, note for instance how 1…Sxf3 pins the d1knight and prevents 2.Sxb2. After the key 1.Sb5!, every defence remarkably stops a new triplet of threats to bring about these cyclic changes: 1…Sxb5 [a] 2.Sxb2 [B], 1…Qf3 [b] 2.Qd4 [C], 1…Rxb5 [c] 2.Qc3 [D], 1…Sf3 [d] 2.Qg8 [A]. An amazing fusion of cyclic shift, Fleck theme (separation of threats), and dual avoidance, this twomover really pushes the envelope!
20 Mar. 2017 – What’s New
Bob Meadley’s excellent series of ebooks continues with the publication of J. K. Heydon: Problemist, Solicitor, Businessman. Joseph Kentigern Heydon (18841947) was a leading Australian problem composer who produced mostly traditional two and threemovers. He was especially skilled in devising mutates (fashionable in his era) and task problems. This volume begins with a biographical chapter that describes Heydon’s multifaceted life as a scientist, solicitor, and author of religious books. His chess activities are then reviewed, and the next chapter covers his stint as the problem editor of the Australasian Chess Review. A “Notes and Scans” section reproduces a variety of materials, such as his entry in Who’s Who in Australia and a letter to the British Chess Magazine that indicates he pioneered a variation of the Evans Gambit. The book concludes with a collection of 62 problems by Heydon; reflecting the difficulties in gathering materials from the early 20th century, Bob mentioned that this is not Heydon’s complete output.
Here are two selections from the ebook, which can be downloaded using the link above. The first twomover shows correction play by three black pieces, unified by White’s selfinterference mates that are made possible by Black’s selfblocks. The key is 1.Be7! (waiting). 1…B~ 2.Sb3, 1…Bc4 2.Sc6, 1…Bxd5 2.Bc5; 1…Sd~ 2.Qc3, 1…Se3 2.Sf3; 1…Sf~ 2.Rd3, 1…Se4 2.Sf5. The judge J.J. O’Keefe commented, “This achieves white interference on four lines with consummate ease and artistry.”
Two of Heydon’s compositions are cited in Jeremy Morse’s seminal Chess Problems: Tasks and Records. One appeared previously on this site as a weekly problem, No.295. The other is a modified version of the above twomover, which brings about a remarkable five changed mates in mutate form. Set mates are prepared for all of Black’s moves: 1…Bb7 2.Qxd7, 1…S~ 2.Qxc5, 1…b3 2.c4, 1…c4 2.Bxc4, 1…g~ 2.Bc4, and 1…e4 2.Sf4. The flightgiving key 1.Se4! (waiting) removes the latter variation but adds another one, 1…Kxe4 2.Qc6. The remaining play is completely changed: 1…Bb7 2.Qxb7, 1…S~ 2.Sf6, 1…b3 2.Sc3, 1…c4 2.Qxc4, and 1…g~ 2.Qd6.
Joseph Heydon Australasian Chess Review 1932 International Tourney, 2nd Commended 

Mate in 2 
Here are two selections from the ebook, which can be downloaded using the link above. The first twomover shows correction play by three black pieces, unified by White’s selfinterference mates that are made possible by Black’s selfblocks. The key is 1.Be7! (waiting). 1…B~ 2.Sb3, 1…Bc4 2.Sc6, 1…Bxd5 2.Bc5; 1…Sd~ 2.Qc3, 1…Se3 2.Sf3; 1…Sf~ 2.Rd3, 1…Se4 2.Sf5. The judge J.J. O’Keefe commented, “This achieves white interference on four lines with consummate ease and artistry.”
Joseph Heydon Good Companions 1921 Complete Block Tourney, 2nd Prize 

Mate in 2 
Two of Heydon’s compositions are cited in Jeremy Morse’s seminal Chess Problems: Tasks and Records. One appeared previously on this site as a weekly problem, No.295. The other is a modified version of the above twomover, which brings about a remarkable five changed mates in mutate form. Set mates are prepared for all of Black’s moves: 1…Bb7 2.Qxd7, 1…S~ 2.Qxc5, 1…b3 2.c4, 1…c4 2.Bxc4, 1…g~ 2.Bc4, and 1…e4 2.Sf4. The flightgiving key 1.Se4! (waiting) removes the latter variation but adds another one, 1…Kxe4 2.Qc6. The remaining play is completely changed: 1…Bb7 2.Qxb7, 1…S~ 2.Sf6, 1…b3 2.Sc3, 1…c4 2.Qxc4, and 1…g~ 2.Qd6.
2 Feb. 2017 – Two selfmates by Laimons Mangalis
In December’s column regarding a new ebook on Laimons Mangalis, I mentioned that he was a proficient composer of selfmates. Since this major problem genre is rarely discussed on this site, it seems a good opportunity to delve into some examples discovered in the book. In selfmates, White plays first and compels Black to mate in the specified number of moves, while Black does not cooperative and resists giving mate. The two selections below are both fine illustrations of the type, presenting appealing and accessible ideas.
In the first problem, Black’s B + K battery pointed at the white king suggests that it will be forced to open and deliver mate at some stage. Hence if Black were to play 1…Sf3 guarding e5 and d4, then 2.Qg7+ Kxg7 mate. This is the only set variation, however, as no selfmatesinone are prepared for the other black moves. Consider the checks 1…Kf8+ and 1…e6+; each by attacking d5 means that 2.Ke5 could be followed by 2…Sf3 mate, but Black is not obliged to move the knight. The key 1.Qh8!, a waiting move, deals with these checks because: (1) 1…Kf8+ now selfpins the black bishop (and also the e7pawn), so that 2.Ke5 does force 2…Sf3 by zugzwang, and (2) after 1…e6+ 2.Ke5, the black king is confined by the queen from its corner position, leaving 2…Sf3 again as Black’s only legal move. The black royal battery fires twice as the mating move: 1…Sf3 2.Qg7+ Kxg7 as in the set play, and 1…e5 2.Qf6+ Kxf6, when White makes a different queen sacrifice to ensure that the black king covers the e5flight.
The second position contains a R + B battery on the first rank, and any bishop move would mate immediately. A set line utilises the battery thus: 1…Ke3 – attacking f2 – 2.Rxe4+ Bxe4. The surprising key 1.Kh1! (waiting) unpins the queen, sparking a fulllength variation when Black moves the bishop: 1…B~+ 2.Qg1+ Rxg1. The black king has two flights on e3 and c5. Taking the first gives 1…Ke3 2.Rxe4+ Bxe4 – unchanged from the set play, though here the queen is pinned on the diagonal instead. If Black takes the second flight, White exploits the unpin of the black knight with 1…Kxc5 2.Qf2+ Sxf2. The final defence 1…c2 admits 2.Qxc2, immobilising the black king, and Black is forced by zugzwang to open the R + B battery once more: 2…Bxc2.
Laimons Mangalis The Problemist 1977 

Selfmate in 2 
In the first problem, Black’s B + K battery pointed at the white king suggests that it will be forced to open and deliver mate at some stage. Hence if Black were to play 1…Sf3 guarding e5 and d4, then 2.Qg7+ Kxg7 mate. This is the only set variation, however, as no selfmatesinone are prepared for the other black moves. Consider the checks 1…Kf8+ and 1…e6+; each by attacking d5 means that 2.Ke5 could be followed by 2…Sf3 mate, but Black is not obliged to move the knight. The key 1.Qh8!, a waiting move, deals with these checks because: (1) 1…Kf8+ now selfpins the black bishop (and also the e7pawn), so that 2.Ke5 does force 2…Sf3 by zugzwang, and (2) after 1…e6+ 2.Ke5, the black king is confined by the queen from its corner position, leaving 2…Sf3 again as Black’s only legal move. The black royal battery fires twice as the mating move: 1…Sf3 2.Qg7+ Kxg7 as in the set play, and 1…e5 2.Qf6+ Kxf6, when White makes a different queen sacrifice to ensure that the black king covers the e5flight.
Laimons Mangalis The Problemist 1977 

Selfmate in 2 
The second position contains a R + B battery on the first rank, and any bishop move would mate immediately. A set line utilises the battery thus: 1…Ke3 – attacking f2 – 2.Rxe4+ Bxe4. The surprising key 1.Kh1! (waiting) unpins the queen, sparking a fulllength variation when Black moves the bishop: 1…B~+ 2.Qg1+ Rxg1. The black king has two flights on e3 and c5. Taking the first gives 1…Ke3 2.Rxe4+ Bxe4 – unchanged from the set play, though here the queen is pinned on the diagonal instead. If Black takes the second flight, White exploits the unpin of the black knight with 1…Kxc5 2.Qf2+ Sxf2. The final defence 1…c2 admits 2.Qxc2, immobilising the black king, and Black is forced by zugzwang to open the R + B battery once more: 2…Bxc2.