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diff --git a/square.c b/square.c
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+++ b/square.c
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+
+// square.c
+
+// includes
+
+#include "colour.h"
+#include "square.h"
+#include "util.h"
+
+// "constants"
+
+static const uint8 SquareFrom64[64] = {
+   A1, B1, C1, D1, E1, F1, G1, H1,
+   A2, B2, C2, D2, E2, F2, G2, H2,
+   A3, B3, C3, D3, E3, F3, G3, H3,
+   A4, B4, C4, D4, E4, F4, G4, H4,
+   A5, B5, C5, D5, E5, F5, G5, H5,
+   A6, B6, C6, D6, E6, F6, G6, H6,
+   A7, B7, C7, D7, E7, F7, G7, H7,
+   A8, B8, C8, D8, E8, F8, G8, H8,
+};
+
+// variables
+
+static sint8 SquareTo64[SquareNb];
+
+// functions
+
+// square_init()
+
+void square_init() {
+
+   int sq;
+
+   for (sq = 0; sq < SquareNb; sq++) SquareTo64[sq] = -1;
+
+   for (sq = 0; sq < 64; sq++) {
+      SquareTo64[SquareFrom64[sq]] = sq;
+   }
+}
+
+// square_is_ok()
+
+bool square_is_ok(int square) {
+
+   if (square < 0 || square >= SquareNb) return FALSE;
+
+   if (SquareTo64[square] < 0) return FALSE;
+
+   return TRUE;
+}
+
+// square_make()
+
+int square_make(int file, int rank) {
+
+   int sq_64;
+
+   ASSERT(file>=0&&file<8);
+   ASSERT(rank>=0&&rank<8);
+
+   sq_64 = (rank << 3) | file;
+
+   return square_from_64(sq_64);
+}
+
+// square_file()
+
+int square_file(int square) {
+
+   int file;
+
+   ASSERT(square_is_ok(square));
+
+   file = (square - 4) & 7;
+   ASSERT(file==(square_to_64(square)&7));
+
+   return file;
+}
+
+// square_rank()
+
+int square_rank(int square) {
+
+   int rank;
+
+   ASSERT(square_is_ok(square));
+
+   rank = (square >> 4) - 2;
+   ASSERT(rank==square_to_64(square)>>3);
+
+   return rank;
+}
+
+// square_side_rank()
+
+int square_side_rank(int square, int colour) {
+
+   int rank;
+
+   ASSERT(square_is_ok(square));
+   ASSERT(colour_is_ok(colour));
+
+   rank = square_rank(square);
+   if (colour_is_black(colour)) rank = 7-rank;
+
+   return rank;
+}
+
+// square_from_64()
+
+int square_from_64(int square) {
+
+   ASSERT(square>=0&&square<64);
+
+   return SquareFrom64[square];
+}
+
+// square_to_64()
+
+int square_to_64(int square) {
+
+   ASSERT(square_is_ok(square));
+
+   return SquareTo64[square];
+}
+
+// square_is_promote()
+
+bool square_is_promote(int square) {
+
+   int rank;
+
+   ASSERT(square_is_ok(square));
+
+   rank = square_rank(square);
+
+   return rank == Rank1 || rank == Rank8;
+}
+
+// square_ep_dual()
+
+int square_ep_dual(int square) {
+
+   ASSERT(square_is_ok(square));
+   ASSERT(square_rank(square)>=2&&square_rank(square)<=5);
+
+   return square ^ 16;
+}
+
+// square_colour()
+
+int square_colour(int square) {
+
+   ASSERT(square_is_ok(square));
+
+   return (square ^ (square >> 4)) & 1;
+}
+
+// file_from_char()
+
+int file_from_char(int c) {
+
+   ASSERT(c>='a'&&c<='h');
+
+   return c - 'a';
+}
+
+// rank_from_char()
+
+int rank_from_char(int c) {
+
+   ASSERT(c>='1'&&c<='8');
+
+   return c - '1';
+}
+
+// file_to_char()
+
+int file_to_char(int file) {
+
+   ASSERT(file>=0&&file<8);
+
+   return 'a' + file;
+}
+
+// rank_to_char()
+
+int rank_to_char(int rank) {
+
+   ASSERT(rank>=0&&rank<8);
+
+   return '1' + rank;
+}
+
+// char_is_file()
+
+bool char_is_file(int c) {
+
+   return c >= 'a' && c <= 'h';
+}
+
+// char_is_rank()
+
+bool char_is_rank(int c) {
+
+   return c >= '1' && c <= '8';
+}
+
+// square_to_string()
+
+bool square_to_string(int square, char string[], int size) {
+
+   ASSERT(square_is_ok(square));
+   ASSERT(string!=NULL);
+   ASSERT(size>=3);
+
+   if (size < 3) return FALSE;
+
+   string[0] = 'a' + square_file(square);
+   string[1] = '1' + square_rank(square);
+   string[2] = '\0';
+
+   return TRUE;
+}
+
+// square_from_string()
+
+int square_from_string(const char string[]) {
+
+   int file, rank;
+
+   ASSERT(string!=NULL);
+
+   if (string[0] < 'a' || string[0] > 'h') return SquareNone;
+   if (string[1] < '1' || string[1] > '8') return SquareNone;
+   if (string[2] != '\0') return SquareNone;
+
+   file = file_from_char(string[0]);
+   rank = rank_from_char(string[1]);
+
+   return square_make(file,rank);
+}
+
+// end of square.cpp
+