Author: phili_ppe
Date: 06:22:21 04/29/03
Problem from Bruno Fargette, dedicated to Camil Seneca. from book : "150 problemes d'echecs" by Camil Seneca. Without the rook at d6 the sole move of black would be Bxf2 then Nxf2 mate. Try number 1 1. Qb1 ? Rd2+ ! 2. Kxd2 ? stalemate 2. Kb3 Rd1 ! 3. Kb2 Rd2+ ! 4. Ka1 Rd1 !! and White is in zugzwang So the goal is to reach the same position ***with black to move*** Try number 2 1. Kb2 ? Rg6 ! 2. Ka1 Rxg4 3. Qb1 Rxa4+ 4. Kb2 Rb4+ 5. ... Rxb1 and Black wins Try number 3 1. Qe4 ? Rb6 ! and the white king cannot move to a1 SOLUTION (I do not give variations because there are too many in my book) of the author : 1. Qb3 !! Rd7 2. Kb2 ! Rd8 3. Ka1 ! Rd7 ! 4. Qc2 ! Rd1+ 5. Qb1 ! Rf1 (c1) 6. Kb2 Rd1 ! 7. Qc1 ! Rf1 8. Kc2 ! Re1 9. Nxe1 ! Bxf2 10. Nxf2+ Kg1 11. Ned3 # This is the theme of the reciprocical zugzwang Note : the 2 first moves are wait moves. *** Remark about programs solvers or infinite analysis *** none of them (Yace, SOS, ChestUci, Crafty) found the solution. They announce mate in 10 with 1. Qe4 Rb6. Here what I did : I played these 2 half moves (so it must be now a mate in 9, right ?). I used Ruffian (as white) in infinite analysis. When Ruffian searched up to 22 plies, it did not announce any mate, just a decisive advantage for white. So I would like to have a absolute opinion about this problem. Thank you. 8/1Q6/3r4/p7/P5N1/5NPp/2K2Ppr/6bk w - - bm Qb3
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