Problem 630: Mark Basisty, Andriy Frolkin & Anatoly Vasylenko - Twomover |
![]() ![]() ![]() 630. Mark Basisty, Andriy Frolkin & Anatoly Vasylenko (Ukraine)
29.11.2015
![]() #2 vvv (14+8)
1.Rg1? [2.Qf6# A], 1...B:g4 2.Rf1# B (Nietvelt)
1...Bg2 2.Se2# C, 1...g5 2.Qg3#, 1...Be5!
1.Rf1? B [2.Se2# C], 1...h:g4 2.Qf6# A, 1...e:d3 2.S1:d3#, 1...Ra1!
1.O-O? [2.Se2#], 1...h:g4 2.Qf6#, 1...e:d3 2.S1:d3#, illegal!
1.R:f3+?, 1...e:f3 2.S1d3#, 1...K:f3 2.O-O#?? illegal!!
1.e7! [2.Se6#], 1...e3 2.d:e3# ,1...h:g4 2.Qf6#, 1...e:d3 2.S1:d3#,
1...B:g4 2.Rf1 # (2.O-O#??? – illegal!!!)
Pseudo Le Grand, Nietvelt.
Retroanalysis-based refutation of white moves performing different functions:
(First move in a try; Mating move; Dual being avoided)! (Authors)
White can castle only if the king has not moved. If so, the black rook reached a2 ony by promoting on a1 which requires promotion by white whereas no white pawn is missing! (Seetharaman) |
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