Author: Robert Hyatt
Date: 07:04:29 03/19/00
Go up one level in this thread
On March 19, 2000 at 09:22:02, Frank Schneider wrote:
>Hi all,
>
>here are two testpositions, one where there is a perpetual check (1. Rg5+) and
>one, slighlty modified, where the perpetual check is no longer possible.
>Which program sees a draw in the first position but not in the 2nd?
>
>Frank
>
>
>Pos 1:
>[D]r7/8/4p3/5b1k/3p3r/Np6/1P4R1/K5R1 w - -
>
>Rg5+ draws by perpetual check (or stalemate)
10-> 6.46 -4.23 1. Rd2 d3 2. Kb1 e5 3. Nb5 Bg6 4. Rc1
Ra5 5. Nd6 Ra2
11 9.87 -4.36 1. Rd2 d3 2. Kb1 Rc8 3. Rf1 Kg5 4.
Rg2+ Kf6 5. Rd2 Ke5 6. Nb5 Rhc4
11-> 12.66 -4.36 1. Rd2 d3 2. Kb1 Rc8 3. Rf1 Kg5 4.
Rg2+ Kf6 5. Rd2 Ke5 6. Nb5 Rhc4
12 15.97 -4.37 1. Rd2 d3 2. Kb1 Rc8 3. Rf1 Kg5 4.
Rg2+ Rg4 5. Rd2 Rf4 6. Rh1 Be4 7. Rc1
12 16.92 ++ 1. Rg5+!!
12 16.95 0.00 1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kxg5
12-> 17.01 0.00 1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kxg5
13 17.16 0.00 1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kxg5
13-> 17.23 0.00 1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kxg5
14 17.35 0.00 1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kxg5
14-> 17.43 0.00 1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kxg5
15 17.68 0.00 1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kxg5
15-> 17.83 0.00 1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kxg5
16 18.33 0.00 1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kxg5
16-> 18.61 0.00 1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kxg5
17 19.64 0.00 1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kxg5
17-> 20.18 0.00 1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kxg5
>
>Pos 2:
>[D]r7/8/8/4p2k/3pb2r/Np6/1P4R1/K5R1 w - -
>
>now there is no longer a perpetual check after Rg5+, e.g.:
>
>1. Rg5+ Kh6 2. Rh5+ Kxh5 3. Rg5+ Kh6 4. Rh5+ Kg7 5. Rg5+ Kf7 6. Rg7+ Ke8 7.
>Re7+ Kd8 8. Rd7+ Kc8 9. Rc7+ Kb8 10. Rc8+ Ka7 11. Rc7+ Bb7
11-> 15.18 -2.94 1. Rg5+ Kh6 2. Rxe5 d3 3. Re6+ Kh7
4. Re7+ Kh8 5. Rf1 Rc8 6. Rd7 Rh2 7.
Re1 d2 8. Rxd2 Rxd2 9. Rxe4
12 30.68 -3.11 1. Rg5+ Kh6 2. Rxe5 d3 3. Re6+ Kh7
4. Re7+ Kh8 5. Rd7 Rh2 6. Re7 Re2 7.
Rd1 Bc6 8. Rf7 Kg8
12-> 31.63 -3.11 1. Rg5+ Kh6 2. Rxe5 d3 3. Re6+ Kh7
4. Re7+ Kh8 5. Rd7 Rh2 6. Re7 Re2 7.
Rd1 Bc6 8. Rf7 Kg8
13 1:03 -3.18 1. Rg5+ Kh6 2. Rxe5 d3 3. Re6+ Kh7
4. Rd6 Rh2 5. Rd4 Re2 6. Rd1 Bg6 7.
Rd7+ Kh6 8. R7xd3 Bxd3 9. Rxd3
13-> 1:05 -3.18 1. Rg5+ Kh6 2. Rxe5 d3 3. Re6+ Kh7
4. Rd6 Rh2 5. Rd4 Re2 6. Rd1 Bg6 7.
Rd7+ Kh6 8. R7xd3 Bxd3 9. Rxd3
14 1:56 -3.28 1. Rg5+ Kh6 2. Rxe5 d3 3. Re6+ Kh7
4. Rd6 Rh2 5. Rd4 Bg6 6. Rd6 d2 7.
Rdxg6 d1=Q+ 8. Rxd1 Kxg6 9. Rf1 Rd2
10. Kb1 Rc8
14-> 2:02 -3.28 1. Rg5+ Kh6 2. Rxe5 d3 3. Re6+ Kh7
4. Rd6 Rh2 5. Rd4 Bg6 6. Rd6 d2 7.
Rdxg6 d1=Q+ 8. Rxd1 Kxg6 9. Rf1 Rd2
10. Kb1 Rc8
I am not sure why any program would break in either of the two positions
above...
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