phase B

2 files changed, 46 insertions, 0 deletions

diff --git a/include/engine/evaluate.h b/include/engine/evaluate.h
new file mode 100644
index 0000000..ecc6e60
--- /dev/null
+++ b/include/engine/evaluate.h
@@ -0,0 +1,10 @@
+#ifndef EVALUATE_H
+#define EVALUATE_H
+
+#include "bitboard.h"
+
+// static evaluation from the side-to-move's point of view.
+// positive == good for the side to move, negative == good for the opponent.
+i32 evaluate(position_t position);
+
+#endif // EVALUATE_H
diff --git a/include/engine/search.h b/include/engine/search.h
new file mode 100644
index 0000000..94b5da5
--- /dev/null
+++ b/include/engine/search.h
@@ -0,0 +1,36 @@
+#ifndef SEARCH_H
+#define SEARCH_H
+
+#include <stdatomic.h>
+
+#include "bitboard.h"
+#include "engine/moves.h"
+#include "engine/ttable.h"
+#include "ipc/go_args.h"
+
+#define SEARCH_MATE 30000
+#define SEARCH_INF 32000
+
+typedef struct {
+  i32 score;
+  move_t best_move;
+} search_result_t;
+
+// shared per-search context. `stop` is signalled by the UCI thread (SIGSTOP),
+// `go_args` carries the time/node/depth limits, `nodes` counts visited nodes.
+typedef struct {
+  ttable_t *ttable;
+  go_args_t *go_args;
+  atomic_bool *stop;
+  u64 *nodes;
+} search_ctx_t;
+
+search_result_t search(
+  position_t position,
+  int depth,
+  int alpha,
+  int beta,
+  search_ctx_t *ctx
+);
+
+#endif // SEARCH_H