Solving Contest S.O.Patron, 2010

In Saturday, July 24 2010 and time 18:30, a Solving Contest, was organized in S.O.Patron (Chess Club of Patras), with chess problems selected by Mr. Ioannis Garoufalidis.

Six problems were presented to solvers (1 two-mover, 1 three-mover, 1 more-mover in 4, a study, a help-mate four-mover, a self-mate three-mover) with a time limit 2,5 hours.

The final ranking of the solvers : Spiliadis Athanassios 14.0/30.0, Terzis Philippos 05.0, Sboukis Konstantinos 5.0, Sboukis Athanassios 05.0, Stamatopoulos Apostolos 04.0, Leftheriotis Aimilios , Stamatopoulos Georgios, Kontogiannis Georgios.

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Here follow the problems and their solutions. Each problem takes 5 grades and we show in square brackets how many grades are given to the key, to the threat and to each variation.

	(Problem 463) Heinonen, Unto, First Prize, ST 2002, Mate in 2 moves. #2 (9 + 10)
[2B3ss/1K3pRr/1ppk4/4R2P/b3PQ2/3p1S2/1S6/2q5]

Key : 1.Qg5! [5.0] ( > 2.Qd8# ) c5 / f6 2.Rd5# / Re6#

	(Problem 464) Chocholouš, Jiři, Second Prize, Tidskrift för Schack, 1903, Mate in 3 moves. #3 (6 + 11)
[2b5/p1p4K/Pp2p3/3pk3/1Q3R2/p5pp/4P2r/2B5]

Key : 1.Be3! [1.0] ( > 2. Rf3 ( > 3.Qf4# ) ) d4 3.Qxd4# [1.0]
1...Rf2 2.Rxf2 [1.0] d4 3.Qxd4#
1...c5 2.Bxc5 [1.0] bxc5 3.Qb8#
1...Bxa6 2.Rf5+ [1.0] Kxf5 3.Qf4# / Qe7#

	(Problem 465) Juchli, Josef, Augsburger Abendzeitung, 1885, Mate in 4 moves. #4 (8 + 11)
[6b1/SB1R1p2/1p2p3/4k1P1/2p3P1/s2p3p/1P1B2p1/3K2s1]

Key : 1.Ba8! zugzwang [1.0]
1...Sa3 ~ 2.Sc6+ Ke4 3.Sa5+ [0.5] Ke5 4.Sxc4#
1...Sg1 ~ 2.Sc6+ Ke4 3.Sd4+ [0.5] Ke5 4.Sxf3#
1...h2 2.Bxg2 Sf3 3.Sc6+ [0.5] Ke4 4.Rd4#
1...c3 2.Sc6+ Ke4 3.Sb4+ [0.5] Ke5 4.Sxd3#
1...b5 2.Bd5 Kd4 3.Sc6+ [0.5] Kc5 4.Be3#
2...exd5 3.Re7+ [0.5] Kd6 / Kd4 4.Bb4# / Be3#
1...f7 ~ 2.Sc6+ Ke4 3.Se7+ [0.5] Ke5 4.Sg6#
1...Bh7 2.Sc6+ Ke4 3.Sd8+ [0.5] Ke5 4.Sxf7#

	(Problem 466) Michelet, Paul, BCM, 2010, White plays and draws. = (4 + 3)
[8/8/8/3B1k2/K7/8/Pp2b1S1/8]

Key : 1.Se3+ [1.0] Ke5 / Kf4
2.Be4! [1.0] Kxe4
3.Sd1!! [2.0] Bxd1
4.Ka3 d1=Q/R? = stalemate
4...d1=B? = draw, since both bishops are white-squared
4...d1=S
5.Kb2 Sd2
6.Kc1 [1.0] = draw, since one light piece will be captured

	(Problem 467) Feather, Chris, Broodings, 2008, Helpmate in 4 moves. Two solutions. h#4 2.1.1.1.1.1.1.1 (4 + 5)
[8/7s/4SB2/4Pbs1/4k3/6p1/8/K7]

1.Sxe6 Bd8 2.Sg7 e6 3.Ke5 e7 4.Kf6 e8=Q# [2.5]
1.Sxf6 exf6 2.Bh7 f7 3.Kf5 f8=Q+ 4.Kg6 Sf4# [2.5]

	(Problem 468) Zabunov, Vladimir N., , Selfmate in 3 moves. s#3 (12 + 12)
[7b/1Q2R3/PpPkPp1r/1p5p/2pKPR1S/1q1pP2B/7B/3s1r2]

Key : 1.Re8! [1.0] ( > 2.Qe7+ Kxc6 3.Qc5+ bxc5# )
1...Sxe3 2.Rg4+ Rf4 3.Sf5+ [1.0] Sxf5#
1...c3 2.Rf5+ Rf4 3.Rd5+ [1.0] Qxd5#
1...Rh7 2.Rxf6+ Rf4 3.e7+ [1.0] Bxf6#