syntax = "proto3";
package hashprobe;

message HashProbeRequest {
	string fen = 1;
}
message HashProbeResponse {
	repeated HashProbeLine line = 1;
}
message HashProbeLine {
	HashProbeMove move = 1;
	bool found = 2;

	repeated HashProbeMove pv = 3;
	int32 value = 4;  // Dynamic eval (may be inexact, see the "bound" field)
	int32 eval = 5;  // Static eval
	int32 depth = 6;

	enum ValueBound {
		BOUND_NONE = 0;
		BOUND_UPPER = 1;
		BOUND_LOWER = 2;
		BOUND_EXACT = 3;
	};
	ValueBound bound = 7;
}

message HashProbeMove {
	string from_sq = 1;  // a1, a2, etc.
	string to_sq = 2;
	string promotion = 3;  // Q, R, etc.
}

service HashProbe {
	rpc Probe(HashProbeRequest) returns (HashProbeResponse) {}
}