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476. Molham Hassan &
Geoff Foster
Australasian Chess 2010
Mate in 2

A good key 1.Qh4! grants a flight on e5 and sets up a battery on the fourth rank, which threatens to open with 2.Sg6. The black knight has three defences that allow the h8-bishop to cover the e5-flight, and they produce three more battery mates: 1…Sh5 2.Sxh5, 1…Se6 2.Sxe6, and 1…Sxf5 2.Sd5 – the latter a pin-mate where White regains control of e3 and d4. A switchback occurs if Black takes the offered flight: 1…Kxe5 2.Qe7. Lastly, 1…d2 is answered by 2.Re2. The three battery variations show a duel between the two knights.

Andy Sag: A flight-giving key with switchback. I like the two variations that self-pin the black knight.
Jacob Hoover: The black knight has three defenses, and each one forces a different knight discovery.
Ian Shanahan: The two star variations are 1…Kxe5 2.Qe7 (the black king takes the flight proffered by the key, met by a switchback and pin-mate), and 1…Sxf5 2.Sd5 (the Schiffmann theme). A fine problem in traditional style.

477. Alfred Figdor
The Australasian Chess Review 1943
1st Prize
Mate in 3

The white knight on f2 has four moves that threaten mate, but three are defeated by its capture while 1.Sg4? is neutralised by 1…Rxb6! The key 1.Ba4!, threatening 2.Be8 and 3.Bxf7, induces Black to disable the four potential defences against the knight moves. 1…c6/Rxa4 2.Sg4 and 3.Sxf6. 1…Bb1 2.Sh1 and 3.Sxg3. 1…c3 2.Sd3 and 3.Sf4. 1…d4 2.Se4 and 3.Sxf6/Sxg3. Consistent white knight play and in three variations Black deftly handles the threat by activating the a2-bishop.

Jacob Hoover: White unravels this problem with 1.Ba4!, sacrificing the bishop to the a6-rook. In each line a black unit either is decoyed away from guarding a vital square or blocks a guard of a vital square.
Andy Sag: The four set plays by the f2-knight make a nice theme.