Author: Tord Romstad
Date: 08:35:30 03/08/04
In the following ECM-GCP position, Bb7 is listed as the only solution move.
Gothmog 0.4.6 initially wants to play Bb7, but then switches to Rxg2+, which
it claims is a mate in 11. Later it switches back to Bb7, with a mate in 9.
Do I have a bug, or do both moves lead to mate?
[d]2b3k1/p4ppp/7q/2Q5/8/P3r1P1/1r4BP/R3R1K1 b - - bm Bb7; id "ECM.1197";
1 1.31 0.00 185 Rxe1+ Rxe1
2 1.62 0.00 654 Rxe1+ Rxe1 Bb7
3 7.72 0.03 4844 Bb7 Rxe3 Rxg2+ Kf1 Qf6+
4 10.34 0.10 13575 Bb7 Kh1 Rxg2 Qxa7 Rxh2+
5 13.06 0.24 32829 Bb7 Re2 Rbxe2 Bh3 Qxh3
6 12.25 0.51 74306 Bb7 Qc8+ Bxc8
7 12.25 0.72 121708 Bb7 Qc8+ Bxc8
8 >= 15.97 3.05 680582 Rxg2+ Kxg2 Bb7+ Kf2 Rf3+ Kg2 Rxa3+ Kg1
Rxg3+ Kf1 Qh3+ Ke2 Rg2+ Qf2 Rxf2+ Kxf2
Qf3+
8 15.97 3.60 797200 Rxg2+ Kf1 Ba6+ Kxg2
9 22.16 7.67 1793331 Rxg2+ Kf1 Ba6+ Kxg2 Bb7+ Kf2 Rf3+ Kg2
Rxa3+ Re4 Bxe4+ Kf1 Rxa1+ Ke2 Ra2+ Qc2
Rxc2+ Ke1 Qxh2
10 >= #103 12.12 3032510 Rxg2+ Kf1 Ba6+ Kxg2 Bb7+ Kf2 Rf3+ Kg2
Rxa3+ Re4 Bxe4+ Kf1 Rxa1+ Ke2 Ra2+ Qc2
Rxc2+ Ke1 Qc1#
10 #11 25.64 6897653 Rxg2+ Kf1 Ba6+ Kxg2 Bb7+ Kf2 Rf3+ Kg2
Rxa3+ Kg1 Rxg3+ Kf1 Qh3+ Ke2 Rg2+ Qf2
Rxf2+
11 >= #10 1:11 21815599 Bb7 Qc8+ Bxc8
11 >= #9 1:21 26474808 Bb7 Qc8+ Bxc8
11 <= #9 1:23 27349074 Bb7 Qc8+ Bxc8 Red1 Rxg2+ Kxg2 Bh3+ Kg1
Re1+ Rxe1 Qb6+ Kh1 Qc6+ Re4 Qxe4+ Kg1 Qd4+
Kh1 Qxa1#
11 #9 1:23 27349074 Bb7 Qc8+ Bxc8 Red1 Rxg2+ Kxg2 Bh3+ Kg1
Re1+ Rxe1 Qb6+ Kh1 Qc6+ Re4 Qxe4+ Kg1 Qd4+
Kh1 Qxa1#
Tord
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