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Use legal positions for endgame initialization

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During endgame initialization we get the material
hash key of each endgame forging and ad-hoc position
that in same cases is illegal (leaves teh king under
capture). This is not a problem for the material key,
but rises an assert when SF is run in debug mode with
'testKingCapture' set in pos_is_ok().

So rewrite the code to always produce legal positions.

No functional change.
This commit is contained in:
Marco Costalba
2014-03-14 09:57:34 +01:00
parent 1f4798a173
commit d0587f2c7f
1 changed files with 3 additions and 4 deletions
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7
src/endgame.cpp
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@@ -82,8 +82,7 @@ namespace {
// Get the material key of Position out of the given endgame key code // Get the material key of Position out of the given endgame key code
// like "KBPKN". The trick here is to first forge an ad-hoc FEN string // like "KBPKN". The trick here is to first forge an ad-hoc FEN string
// and then let a Position object do the work for us. Note that the // and then let a Position object do the work for us.
// FEN string could correspond to an illegal position.
Key key(const string& code, Color c) { Key key(const string& code, Color c) {
assert(code.length() > 0 && code.length() < 8); assert(code.length() > 0 && code.length() < 8);
@@ -94,8 +93,8 @@ namespace {
std::transform(sides[c].begin(), sides[c].end(), sides[c].begin(), tolower); std::transform(sides[c].begin(), sides[c].end(), sides[c].begin(), tolower);
string fen = sides[0] + char('0' + int(8 - code.length())) string fen = sides[0] + char(8 - sides[0].length() + '0') + "/8/8/8/8/8/8/"
+ sides[1] + "/8/8/8/8/8/8/8 w - - 0 10"; + sides[1] + char(8 - sides[1].length() + '0') + " w - - 0 10";
return Position(fen, false, NULL).material_key(); return Position(fen, false, NULL).material_key();
} }