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Fix trump-void1 move ordering to restore v2.9 search efficiency #213

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Fix trump-void1 move ordering to restore v2.9 search efficiency #213

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2182b0f
Fix trump-void1 move ordering to restore v2.9 search efficiency
tameware Jun 27, 2026
8ecebc8
Fix incorrect comment
tameware Jun 28, 2026
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48 changes: 8 additions & 40 deletions library/src/heuristic_sorting/heuristic_sorting.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -676,49 +676,17 @@ void weight_alloc_trump_void1(HeuristicContext& ctx)
unsigned short suitCount = tpos.length[curr_hand][suit];
int suitAdd;

if (suit == trump)
if (lead_suit == trump) // We pitch
{
// We trump a non-trump card.

if (tpos.length[partner_lh][lead_suit] != 0)
{
// 3rd hand will follow.
if ((tpos.rank_in_suit[rho_lh][lead_suit] >
(tpos.rank_in_suit[partner_lh][lead_suit] |
bit_map_rank[ctx.lead0_rank])) ||
((tpos.length[rho_lh][lead_suit] == 0) &&
(tpos.length[rho_lh][trump] != 0)))
{
// Partner can win with a card or by ruffing.
suitAdd = 60 + (suitCount << 6) / 44;
}
else
{
suitAdd = -2 + (suitCount << 6) / 36;
// Don't ruff from Kx.
if ((suitCount == 2) &&
(tpos.second_best[suit].hand == curr_hand))
suitAdd += -4;
}
}
else if ((tpos.length[rho_lh][lead_suit] == 0) &&
(tpos.rank_in_suit[rho_lh][trump] >
tpos.rank_in_suit[partner_lh][trump]))
{
// Partner can overruff 3rd hand.
suitAdd = 60 + (suitCount << 6) / 44;
}
else if ((tpos.length[partner_lh][trump] == 0) &&
(tpos.rank_in_suit[rho_lh][lead_suit] >
bit_map_rank[ctx.lead0_rank]))
{
// 3rd hand has no trumps, and partner has suit winner.
suitAdd = 60 + (suitCount << 6) / 44;
}
if (tpos.rank_in_suit[rho_lh][lead_suit] >
(tpos.rank_in_suit[partner_lh][lead_suit] |
bit_map_rank[ctx.lead0_rank]))
// RHO can win.
suitAdd = (suitCount << 6) / 44;
else
{
suitAdd = -2 + (suitCount << 6) / 36;
// Don't ruff from Kx.
// Don't pitch from Kx.
suitAdd = (suitCount << 6) / 36;
if ((suitCount == 2) &&
(tpos.second_best[suit].hand == curr_hand))
suitAdd += -4;
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