Author: Pete Galati
Date: 12:19:39 03/08/00
Go up one level in this thread
On March 08, 2000 at 14:57:49, Robert Hyatt wrote:
>On March 08, 2000 at 12:50:31, Brian Richardson wrote:
>
>>Tinker ran into the following against Redbear the other day:
>>
>>8/3b1P2/8/4n3/3k1KP1/8/8/8 w - -
>>
>>Tinker moved f8 "thinking" f8=N to avoid the fork ng6, but "forgot" to
>>specifically mention the promotion piece, so the move f8=Q was made (in Winboard
>>and by ICS). This created errors and Tinker lost the game. This is the first
>>time in close to 1,500 games on ICS that an underpromotion has come up.
>>
>>Just thought I would post it so others can check their programs too...
>
>
>This happened to crafty in an ending vs a GM a couple of years ago. There was
>some sort of server change where suddenly the 'case' of the promotion piece
>was important... I had the wrong case and in a similar mating position,
>crafty played=N, the opponent saw =Q and basically crafty lost on time in
>a dead lost position, because=N won, =Q let the opponent get in a critical
>check and mate crafty. The mate didn't happen because crafty would not
>accept anything but a K move by the opponent since it thought the knight
>check had to be honored.
>
>I have seen several =N endings... I have watched at least 1/2 dozen games
>where that made a difference... out of a bunch, of course. :)
Crafty on my slow computer, it wasn't going to change it's mind about f8=N so I
stopped the analyze.
White(1): info
Crafty version 17.8
hash table memory = 12M bytes.
pawn hash table memory = 1M bytes.
EGTB cache memory = 1M bytes.
60 moves/30 minutes 0 seconds primary time control
30 moves/15 minutes 0 seconds secondary time control
frequency (freq)..............1.00
static evaluation (eval)......0.10
learning (learn)..............0.30
CAP (CAP score)...............1.00
White(1): read tinker.pgn
+---+---+---+---+---+---+---+---+
8 | | | | | | | | |
+---+---+---+---+---+---+---+---+
7 | | | | *B| | P | | |
+---+---+---+---+---+---+---+---+
6 | | | | | | | | |
+---+---+---+---+---+---+---+---+
5 | | | | | *N| | | |
+---+---+---+---+---+---+---+---+
4 | | | | *K| | K | P | |
+---+---+---+---+---+---+---+---+
3 | | | | | | | | |
+---+---+---+---+---+---+---+---+
2 | | | | | | | | |
+---+---+---+---+---+---+---+---+
1 | | | | | | | | |
+---+---+---+---+---+---+---+---+
a b c d e f g h
White(1): d
White(1): analyze
end-game phase
clearing hash tables
time surplus 0.00 time limit 30.00 (3:00)
nss depth time score variation (1)
11 7.84 -2.88 1. f8=N Nd3+ 2. Kg3 Bc6 3. g5 Ke5 4.
Ng6+ Ke4 5. Ne7 Bd7 6. g6 Nf4 7. Kh4
11-> 8.64 -2.88 1. f8=N Nd3+ 2. Kg3 Bc6 3. g5 Ke5 4.
Ng6+ Ke4 5. Ne7 Bd7 6. g6 Nf4 7. Kh4
12 18.22 -2.96 1. f8=N Nd3+ 2. Kg3 Bc6 3. g5 Ke5 4.
Ng6+ Ke4 5. Ne7 Bd7 6. g6 Nf4 7. Kh4
Be6
12-> 18.96 -2.96 1. f8=N Nd3+ 2. Kg3 Bc6 3. g5 Ke5 4.
Ng6+ Ke4 5. Ne7 Bd7 6. g6 Nf4 7. Kh4
Be6
13 48.54 -2.89 1. f8=N Nd3+ 2. Kg3 Bc6 3. g5 Bd5 4.
Ng6 Ke3 5. Nh4 Ke4 6. g6 Ke5 7. Kg4
Be4
13-> 50.20 -2.89 1. f8=N Nd3+ 2. Kg3 Bc6 3. g5 Bd5 4.
Ng6 Ke3 5. Nh4 Ke4 6. g6 Ke5 7. Kg4
Be4
14 3:38 ++ 1. f8=N!!
14-> 4:33 -2.50 1. f8=N Nd3+ 2. Kg3 Bc6 3. g5 Bd5 4.
Ng6 Ke3 5. Nh4 Ke4 6. g6 Ke5 7. Kg4
Be4
White(1): exit
White(1): q
execution complete.
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