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Article #1481

Ambiguous "hint", incorrect "show escape"

#1481
From: Yeremein
Date: Sat, 05 Apr 2003 16:02
109 lines
3731 bytes
Okay, here's what I get with the official 5.06 source, compiled myself 
under Cygwin on Windows 2000 (I've snipped out some details for brevity):

-------------

White (1) : setboard 3k4/R1R5/2B5/2N3N1/K7/8/8 w
White (1) : hint
Hint: Ne4
White (1) : Ne4
Ambiguous move:  Ne4
[...]
Illegal move: Ne4
White (1) : show moves
Nb3   0    Nd3   0    Nce4   0     Na6   0   Nce6#   0
Nb7+  0    Nd7   0     Nf3   0     Nh3   0    Nge4   0
Nge6# 0   Nf7#   0     Nh7   0     Ka3   0     Kb3   0
Kb4   0    Ka5   0     Kb5   0     Bh1   0     Bg2   0
Bf3   0    Be4   0     Bb5   0     Bd5   0     Bb7   0
Bd7   0    Ba8   0     Be8 -350    Ra5   0     Ra6   0
Rab7  0   Ra8+   0    Rcb7   0    Rd7+   0     Re7   0
Rf7   0    Rg7   0     Rh7   0    Rc8+ -550
No. of moves generated = 39
White (1) : go
[...]
My move is : Nge6#
1-0 {computer wins as white}

-------------

The listings in "show moves" and the official move given _are_ 
disambiguated, it's just the "hint" response that isn't.

The "hint" response is kind of stupid, too... it's a stalemate, when a 
checkmate is possible... but that's another question, I guess.  Or maybe 
it isn't.

Now, regarding the non-empty "show escape" result when the user isn't in 
check... here's an example transcript:

-------------

GNU Chess 5.06
Transposition table:  Entries=1K Size=48K
Pawn hash table: Entries=0K Size=32K
White (1) : force
White (1) : e4
1. e4

black  KQkq  e3
r n b q k b n r
p p p p p p p p
. . . . . . . .
. . . . . . . .
. . . . P . . .
. . . . . . . .
P P P P . P P P
R N B Q K B N R

Black (1) : f5
1. f5

white  KQkq  f6
r n b q k b n r
p p p p p . p p
. . . . . . . .
. . . . . p . .
. . . . P . . .
. . . . . . . .
P P P P . P P P
R N B Q K B N R

White (2) : Qh5
2. Qh5

black  KQkq
r n b q k b n r
p p p p p . p p
. . . . . . . .
. . . . . p . Q
. . . . P . . .
. . . . . . . .
P P P P . P P P
R N B . K B N R

Black (2) : show escape
    g6   0
No. of moves generated = 1
Black (2) : g6
2. g6

white  KQkq
r n b q k b n r
p p p p p . . p
. . . . . . p .
. . . . . p . Q
. . . . P . . .
. . . . . . . .
P P P P . P P P
R N B . K B N R

White (3) : show escape
   Kd1   0         Ke2   0
No. of moves generated = 2
White (3) :

-------------

As you can see, white has two escape moves given even though white is 
not in check.
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From: Yeremein <yeremein@nonexistent.net>
Newsgroups: gnu.chess
Subject: Ambiguous "hint", incorrect "show escape"
Date: Sat, 05 Apr 2003 09:02:57 -0700
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