From 70a42eeb0b728692838bdf54fff27eaa7497bf67 Mon Sep 17 00:00:00 2001
From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Wed, 25 Dec 2019 12:33:00 +0100
Subject: [PATCH] Generalize sittuyin promotion

No functional change.
---
 src/movegen.cpp |    2 +-
 src/variant.cpp |    1 +
 2 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/movegen.cpp b/src/movegen.cpp
index e0b0377..119c205 100644
--- a/src/movegen.cpp
+++ b/src/movegen.cpp
@@ -191,7 +191,7 @@ namespace {
             Square from = pop_lsb(&pawns);
             for (PieceType pt : pos.promotion_piece_types())
             {
-                if (pos.count(Us, pt))
+                if (pos.promotion_limit(pt) && pos.promotion_limit(pt) <= pos.count(Us, pt))
                     continue;
                 Bitboard b = (pos.attacks_from(Us, pt, from) & ~pos.pieces()) | from;
                 if (Type == EVASIONS)
diff --git a/src/variant.cpp b/src/variant.cpp
index f02c826..1d9ce18 100644
--- a/src/variant.cpp
+++ b/src/variant.cpp
@@ -296,6 +296,7 @@ namespace {
         v->sittuyinRookDrop = true;
         v->promotionRank = RANK_1; // no regular promotions
         v->sittuyinPromotion = true;
+        v->promotionLimit[FERS] = 1;
         v->immobilityIllegal = false;
         v->countingRule = ASEAN_COUNTING;
         v->nMoveRule = 50;
-- 
1.7.0.4