Author: Dann Corbit
Date: 11:54:51 01/05/00
Go up one level in this thread
On January 05, 2000 at 14:18:48, José de Jesús García Ruvalcaba wrote:
>Many years ago I composed the following study:
>8/8/3k3P/b4K2/8/8/8/5N2 w - - 0 1
> According to my analysis, it is a win for white. My main line was 1. Ne3 Ke7 2.
>Kg6 Kf8 3. Nd5 Kg8 4. h7+ Kh8 5. Ne7 and mate in three more moves (this last
>move was the motiv I was trying to exploit, it is the longest forced mate with
>this material, the black bishop on dark squares the white king in g6, the white
>pawn in h7 and the black king in h8). Unfortunately, 4. Nf6+ Kh8 5. Ne4 is also
>a win for white, for this reason I did not submit this position for publication.
> I do not remember exactly why other first moves do not win, and how does white
>win after 1... Bc3. Could somebody with tablebases please confirm the following?
>-It is a win for white.
>-The only winning move is 1. Ne3
>-The main line I posted is correct.
> Thanks in advance. Any supplementary analysis is also appreciated.
I suggest Heiner Marxen's fabulous Chest program. It can solve any 8 move
checkmate that I have tried overnight (no matter how cluttered the board is),
and some of them in just a few moments. It will also solve almost all 9 move
checkmates overnight, but some will take a weekend. It does more than a chess
program ever could, in that it will write a detailed refutation table if you ask
it to (though for 8 moves, you have better trim it down some by starting at a
much later point or you'll be sorry). The version on Heiner's web site is
already UNIX ready, so your Solaris port should be a snap.
http://www.drb.insel.de/~heiner/Chess/chest.html
Heiner's tool does not use tablebase files, but that is on the todo list.
By the way, Ne3!! is definitely the winning move, but that position takes at
least ten moves for checkmate, doesn't it?
I have the 4 piece tablebase files only, but here is what Crafty says so far:
EPD Kit revision date: 1996.04.21
unable to open book file [e:/crafty/release/book.bin].
book is disabled
unable to open book file [e:/crafty/release/books.bin].
search time set to 1800.00.
using cpu time
Crafty 17.6 vs ferret
pondering enabled.
EGTB cache memory = 16M bytes.
hash table memory = 48M bytes.
pawn hash table memory = 8M bytes.
play best book line after search.
EGTB access enabled
using tbpath=e:/crafty/release/tb,F:/KBP
4 piece tablebase files found
1302kb of RAM used for TB indices and decompression tables
PFGA: EPD record: 1
end-game phase
clearing hash tables
time surplus 0.00 time limit 30:00 (30:00)
nss depth time score variation (1)
White(1): exit
10 11.37 2.63 1. Kf6 Bc3+ 2. Kf7 Kd5 3. Kg8 Ke4 4.
h7 Kf4 5. Nd2 Bd4 6. Nc4 Kg4
10-> 12.49 2.63 1. Kf6 Bc3+ 2. Kf7 Kd5 3. Kg8 Ke4 4.
h7 Kf4 5. Nd2 Bd4 6. Nc4 Kg4
11 13.99 2.77 1. Kf6 Bc3+ 2. Kf7 Ke5 3. h7 Kf4 4.
Kg8 Bf6 5. Nd2 Ke5 6. Nc4+ Kf5 7. Ne3+
Kg5 8. Nd5
11-> 15.85 2.77 1. Kf6 Bc3+ 2. Kf7 Ke5 3. h7 Kf4 4.
Kg8 Bf6 5. Nd2 Ke5 6. Nc4+ Kf5 7. Ne3+
Kg5 8. Nd5
12 16.55 2.77 1. Kf6 Bc3+ 2. Kf7 Ke5 3. h7 Kf4 4.
Kg8 Bf6 5. Nd2 Ke5 6. Nc4+ Kf5 7. Ne3+
Kg5 8. Nd5 Be5
12-> 18.77 2.77 1. Kf6 Bc3+ 2. Kf7 Ke5 3. h7 Kf4 4.
Kg8 Bf6 5. Nd2 Ke5 6. Nc4+ Kf5 7. Ne3+
Kg5 8. Nd5 Be5
13 21.04 2.73 1. Kf6 Bc3+ 2. Kf7 Ke5 3. h7 Kf4 4.
Kg8 Bf6 5. Nd2 Ke5 6. Nb3 Kf4 7. Nc5
Kf5 8. Nd7
13 22.24 2.77 1. Ne3 Ke7 2. Kg6 Kf8 3. Nd5 Kg8 4.
Nf6+ Kh8 5. Ne4 Be1 6. Ng5 Bc3 7. Ne6
Be5
13-> 24.00 2.77 1. Ne3 Ke7 2. Kg6 Kf8 3. Nd5 Kg8 4.
Nf6+ Kh8 5. Ne4 Be1 6. Ng5 Bc3 7. Ne6
Be5
14 26.06 2.68 1. Ne3 Ke7 2. Kg6 Kf8 3. Nd5 Kg8 4.
Nf6+ Kh8 5. Ne4 Be1 6. Ng5 Bc3 7. Ne6
Be5 8. Nc5
14 29.78 2.76 1. Kf6 Bc3+ 2. Kf7 Ke5 3. h7 Kf4 4.
Nd2 Bh8 5. Nc4 Bd4 6. Kf8 Bf6 7. Kg8
Kf5 8. Nd6+ Ke5 9. Nb5
14-> 35.69 2.76 1. Kf6 Bc3+ 2. Kf7 Ke5 3. h7 Kf4 4.
Nd2 Bh8 5. Nc4 Bd4 6. Kf8 Bf6 7. Kg8
Kf5 8. Nd6+ Ke5 9. Nb5
15 40.79 2.78 1. Kf6 Bc3+ 2. Kf7 Ke5 3. h7 Kf4 4.
Nd2 Bh8 5. Nc4 Bd4 6. Kg8 Bc3 7. Nd6
Kg4 <HT>
15 41.63 ++ 1. Ne3!!
15 47.67 6.62 1. Ne3 Bc3 2. Kg6 Kd7 3. Kf7 Bd2 4.
h7 Bc3 5. Nf5 Bh8 6. Kg8 Ke6 7. Ng7+
Kf6 8. Kxh8 Kf7 9. Nf5
15-> 51.52 6.62 1. Ne3 Bc3 2. Kg6 Kd7 3. Kf7 Bd2 4.
h7 Bc3 5. Nf5 Bh8 6. Kg8 Ke6 7. Ng7+
Kf6 8. Kxh8 Kf7 9. Nf5
16 57.72 -- 1. Ne3
16 1:02 6.77 1. Ne3 Bc3 2. Kg6 Kd7 3. Nd5 Bh8 4.
Kf7 Kd8 5. Ne7 Ba1 6. Nf5 Bc3 7. h7
Bh8 8. Kg8 Ke8 9. Kxh8
16-> 1:11 6.77 1. Ne3 Bc3 2. Kg6 Kd7 3. Nd5 Bh8 4.
Kf7 Kd8 5. Ne7 Ba1 6. Nf5 Bc3 7. h7
Bh8 8. Kg8 Ke8 9. Kxh8
17 1:24 -- 1. Ne3
17 1:27 6.47 1. Ne3 Bc3 2. Kg6 Kd7 3. Kf7 Bd2 4.
h7 Bc3 5. Nf5 Bh8 6. Kg8 Ke6 7. Ng7+
Ke7 8. Nh5 Ke8 9. Kxh8 Kf7 10. Nf4
17-> 1:50 6.47 1. Ne3 Bc3 2. Kg6 Kd7 3. Kf7 Bd2 4.
h7 Bc3 5. Nf5 Bh8 6. Kg8 Ke6 7. Ng7+
Ke7 8. Nh5 Ke8 9. Kxh8 Kf7 10. Nf4
18 1:59 ++ 1. Ne3!!
18 3:21 9.50 1. Ne3 Bc3 2. Kg6 Kd7 3. Nd5 Be5 4.
Kf7 Bh8 5. Nf6+ Kc6 6. Ne8 Bd4 7. Ng7
Kb5 8. h7 Be3 9. Ke6 Kc4 10. h8=Q Kd3
18-> 4:25 9.50 1. Ne3 Bc3 2. Kg6 Kd7 3. Nd5 Be5 4.
Kf7 Bh8 5. Nf6+ Kc6 6. Ne8 Bd4 7. Ng7
Kb5 8. h7 Be3 9. Ke6 Kc4 10. h8=Q Kd3
19 5:10 9.55 1. Ne3 Bc3 2. Kg6 Kd7 3. Nd5 Be5 4.
Kf7 Bh8 5. Nf6+ Kc6 6. Ne8 Bd4 7. Ng7
Kb5 8. h7 Bc3 9. h8=Q Kc4 10. Qc8+
Kb3 11. Qb7+ Kc2 12. Ke6
19-> 7:34 9.55 1. Ne3 Bc3 2. Kg6 Kd7 3. Nd5 Be5 4.
Kf7 Bh8 5. Nf6+ Kc6 6. Ne8 Bd4 7. Ng7
Kb5 8. h7 Bc3 9. h8=Q Kc4 10. Qc8+
Kb3 11. Qb7+ Kc2 12. Ke6
20 10:02 9.55 1. Ne3 Bc3 2. Kg6 Kd7 3. Nd5 Be5 4.
Kf7 Bh8 5. Nf6+ Kc6 6. Ne8 Bd4 7. Ng7
Kb5 8. h7 Kc4 9. h8=Q Kd3 10. Ke6 Bxg7
11. Qxg7 Ke4 12. Qg8
20 16:16 4/11 1. Ke4
Thanks for that game, by the way. It will take me at least 3 or 4 days to enjoy
it.
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