Author: Jim Monaghan
Date: 22:59:24 12/22/01
Hi,
This position is Capablanca-Kostic, 1919
[D]8/4bkp1/5p1p/r1pR1P1K/1pP4P/1P2B3/5P2/8 w - - 0 1
Black's in a bad way. To win White just needs to penetrate to g6 with his king.
1. Rd7 Ke8 2. Rd3 Kf7 3. Rd5! (zugzwang, same initial position but with black to
move)
If 3... Bf8 4. Rd7+ Be7 5. Rc7!
Kostic chose: 3... Ra3 4. Bxc5 Bxc5 5. Rxc5 Rxb3 6. Rc7+ Kf8 7. Kg6 Rf3 8. Rf7+
Ke8 9. Rxg7 Rf4 10. h5 Rxc4 and lost in another 15 moves.
I fed this to both Crafty and Yace. Crafty goes on a wild adventure by giving up
the exchange. Yace sees the zugzwang idea for awhile but then forgets about it,
and plays more normally, without necessarily proving the win. My computer is
rather slow. On fast machines does any program see the main idea and stick with
it. Or is this a good test position?
Crafty 18.12
(+0.31) 1. Kg4 Ke8 2. h5 Ra3 3. Rd3 Ra7 4. Kf4 Rd7 5. Rd5
(+0.31) 1. Kg4 Ke8 2. h5 Ra3 3. Rd3 Ra7 4. Kf4 Rd7 5. Rd5
(+0.20) 1. Kg4 Ke8 2. h5 Ra3 3. Rd3 Ra1 4. Bf4 Re1 5. Re3 Rd1
(+0.20) 1. Kg4 Ke8 2. h5 Ra3 3. Rd3 Ra1 4. Bf4 Re1 5. Re3 Rd1
(+0.38) 1. Kg4 Ke8 2. h5 Ra3 3. Bxc5 Bxc5 4. Rxc5 Rxb3 5. Rc8+ Kd7 6. Rg8 Rc3
7. Rxg7+ Kd6
(+0.38) 1. Kg4 Ke8 2. h5 Ra3 3. Bxc5 Bxc5 4. Rxc5 Rxb3 5. Rc8+ Kd7 6. Rg8 Rc3
7. Rxg7+ Kd6
(+0.23) 1. Kg4 Ra3 2. Bxc5 Bxc5 3. Rxc5 Rxb3 4. Rc7+ Kf8 5. Rb7 Rb1 6. h5 b3 7.
c5 Rc1 8. Rxb3 Rxc5
(+0.24) 1. f3 Ra3 2. Bxc5 Bxc5 3. Rxc5 Rxb3 4. Rc7+ Kf8 5. Kg6 Rxf3 6. Rf7+ Ke8
7. Kxg7 Rxf5 8. Kg6
(+0.24) 1. f3 Ra3 2. Bxc5 Bxc5 3. Rxc5 Rxb3 4. Rc7+ Kf8 5. Kg6 Rxf3 6. Rf7+ Ke8
7. Kxg7 Rxf5 8. Kg6
(+0.17) 1. f3 Ra3 2. Bxc5 Bxc5 3. Rxc5 Rxb3 4. Rc7+ Kf8 5. Kg6 Rxf3 6. Rf7+ Ke8
7. Kxg7 Rf4 8. c5 Rc4
(+0.30) 1. Kg4 Ra3 2. Rd3 Ra1 3. h5 Rg1+ 4. Kf4 Ke8 5. Ke4 Rh1 6. Rd5 Rxh5 7.
Bxc5 Rh4+ 8. f4 Bxc5 9. Rxc5
(+0.30) 1. Kg4 Ra3 2. Rd3 Ra1 3. h5 Rg1+ 4. Kf4 Ke8 5. Ke4 Rh1 6. Rd5 Rxh5 7.
Bxc5 Rh4+ 8. f4 Bxc5 9. Rxc5
(+0.29) 1. Kg4 Ra3 2. Rd3 Ra1 3. h5 Rg1+ 4. Kf4 Rh1 5. Rd7 Ke8 6. Rxe7+ Kxe7 7.
Bxc5+ Kd7 8. Bxb4 Rh4+ 9. Ke3 Rxh5
(+0.29) 1. Kg4 Ra3 2. Rd3 Ra1 3. h5 Rg1+ 4. Kf4 Rh1 5. Rd7 Ke8 6. Rxe7+ Kxe7 7.
Bxc5+ Kd7 8. Bxb4 Rh4+ 9. Ke3 Rxh5
(+0.22) 1. Kg4 Ra3 2. Rd3 Ra1 3. h5 Rg1+ 4. Kf4 Rh1 5. Rd7 Ke8 6. Rxe7+ Kxe7 7.
Bxc5+ Kd7 8. Bf8 Rh4+ 9. Ke3 Rxh5 10. Bxg7 Rxf5 11. Bxh6
Yace 0.99.56:
(+0.28) t 1.f3 Ra3 2.Rd3 {0}
(+0.28) . 1.f3 Ra3 2.Rd3 {0}
(+0.18) t 1.f3 Ra3 2.Rd7 Rxb3 {-80}
(+0.18) . 1.f3 Ra3 2.Rd7 Rxb3 {-80}
(+0.31) t 1.f3 Ra3 2.Rd3 Ra2 3.Rd7 {0}
(+0.31) . 1.f3 Ra3 2.Rd3 Ra2 3.Rd7 {0}
(+0.21) t 1.f3 Ra3 2.Rd3 Ra5 3.Bf2 Ra2 {0}
(+0.21) . 1.f3 Ra3 2.Rd3 Ra5 3.Bf2 Ra2 {0}
(+0.26) t 1.f3 Ra3 2.Rd3 Ra6 3.Bf2 Rd6 4.Re3 {0}
(+0.26) . 1.f3 Ra3 2.Rd3 Ra6 3.Bf2 Rd6 4.Re3 {0}
(+0.21) t 1.f3 Ra3 2.Rd3 Ra7 3.Kg4 Ra3 4.h5 g5 {0}
(+0.21) . 1.f3 Ra3 2.Rd3 Ra7 3.Kg4 Ra3 4.h5 g5 {0}
(+0.31) t 1.f3 Ra2 2.Rd3 Rb2 3.Bf4 Re2 4.Rd7 Re1 5.Bc7 {0}
(+0.32) t+ 1.Rd7 Ke8 2.Rd3 Kf7 3.Kg4 g5 4.hxg5 Ra3 {80}
(+0.34) t 1.Rd7 Ke8 2.Rd3 Ra6 3.f3 Kf8 4.Bxc5H Bxc5H 5.f4H {HT} {-270}
(+0.34) . 1.Rd7 Ke8 2.Rd3 Ra6 3.f3 Kf8 4.Bxc5 Bxc5 5.f4 {HT} {-270}
(+0.35) t 1.Rd7 Ke8 2.Rd3 Kf7 3.Kg4 Ra1 {0}
(+0.35) . 1.Rd7 Ke8 2.Rd3 Kf7 3.Kg4 Ra1 {0}
(+0.33) t 1.Rd7 Ke8 2.Rd3 Kf7 3.Kg4 Ra1 4.f3 Re1 5.h5 Re2 6.Bf4 {0}
(+0.33) . 1.Rd7 Ke8 2.Rd3 Kf7 3.Kg4 Ra1 4.f3 Re1 5.h5 Re2 6.Bf4 {0}
(+0.40) t 1.Rd7 Ke8 2.Rc7 Ra3 3.Bxc5 Bxc5 4.Rxc5 Rxb3 5.Kg6 Rh3 6.Kxg7 Rxh4
7.Kxf6 Re4 {80}
(+0.40) . 1.Rd7 Ke8 2.Rc7 Ra3 3.Bxc5 Bxc5 4.Rxc5 Rxb3 5.Kg6 Rh3 6.Kxg7 Rxh4
7.Kxf6 Re4 {80}
(+0.46) t 1.Rd7 Ke8 2.Rc7 Kd8 3.Rb7 Ra3 4.Rb8+ Kd7 5.Rg8 Rxb3 6.Rxg7 Kd8 7.Bxh6
Rf3 8.Rg8+ Kd7 {80}
(+0.46) . 1.Rd7 Ke8 2.Rc7 Kd8 3.Rb7 Ra3 4.Rb8+ Kd7 5.Rg8 Rxb3 6.Rxg7 Kd8 7.Bxh6
Rf3 8.Rg8+ Kd7 {80}
(+0.45) t 1.Rd7 Ke8 2.Rd3 Kf7 3.Rd5 Ra2H 4.Rd7H Ke8H 5.Rxe7+H Kxe7H 6.Bxc5+H
Kd7H 7.Bxb4H Rxf2H 8.Bd2H {HT}
(+0.45) . 1.Rd7 Ke8 2.Rd3 Kf7 3.Rd5 Ra2 4.Rd7 Ke8 5.Rxe7+ Kxe7 6.Bxc5+ Kd7
7.Bxb4 Rxf2 8.Bd2
(+0.44) t 1.Rd7 Ke8 2.Rc7 Kd8 3.Rb7 Ra3 4.Rb8+ Kd7 5.Rg8 Rxb3H 6.Rxg7H {0}
(+0.44) . 1.Rd7 Ke8 2.Rc7 Kd8 3.Rb7 Ra3 4.Rb8+ Kd7 5.Rg8 Rxb3 6.Rxg7 {0}
(+0.46) t 1.Rd7 Ke8 2.Rc7 Kd8 3.Rb7 Ra3 4.Kg6 Rxb3 5.Kxg7 Ke8 6.h5 Rc3 7.Rxe7+
Kxe7 8.Bxc5+ Kd7 9.Bxb4 Rxc4 10.Bd2 Rh4 {-70}
(+0.46) . 1.Rd7 Ke8 2.Rc7 Kd8 3.Rb7 Ra3 4.Kg6 Rxb3 5.Kxg7 Ke8 6.h5 Rc3 7.Rxe7+
Kxe7 8.Bxc5+ Kd7 9.Bxb4 Rxc4 10.Bd2 Rh4 {-70}
(+0.56) t 1.Rd7 Ke8 2.Rc7 Kd8 3.Rb7 Ra3 4.Kg6 Rxb3 5.Kxg7 Rc3 6.Kf7 Bd6 7.Ke6
Be5 8.Bxc5 b3 9.Kd5 h5 {80}
(+0.56) . 1.Rd7 Ke8 2.Rc7 Kd8 3.Rb7 Ra3 4.Kg6 Rxb3 5.Kxg7 Rc3 6.Kf7 Bd6 7.Ke6
Be5 8.Bxc5 b3 9.Kd5 h5 {80}
Thanks and Merry Christmas to all here,
Jim
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