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diff --git a/src/fathom/tbconfig.h b/src/fathom/tbconfig.h
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+/*
+ * tbconfig.h
+ * (C) 2015 basil, all rights reserved,
+ * Modifications Copyright 2016-2017 Jon Dart
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef TBCONFIG_H
+#define TBCONFIG_H
+
+/****************************************************************************/
+/* BUILD CONFIG:                                                            */
+/****************************************************************************/
+
+/*
+ * Define TB_CUSTOM_POP_COUNT to override the internal popcount
+ * implementation. To do this supply a macro or function definition
+ * here:
+ */
+/* #define TB_CUSTOM_POP_COUNT(x) <DEFINITION> */
+
+/*
+ * Define TB_CUSTOM_LSB to override the internal lsb
+ * implementation. To do this supply a macro or function definition
+ * here:
+ */
+/* #define TB_CUSTOM_LSB(x) <DEFINITION> */
+
+/*
+ * Define TB_NO_STDINT if you do not want to use <stdint.h> or it is not
+ * available.
+ */
+/* #define TB_NO_STDINT */
+
+/*
+ * Define TB_NO_STDBOOL if you do not want to use <stdbool.h> or it is not
+ * available or unnecessary (e.g. C++).
+ */
+/* #define TB_NO_STDBOOL */
+
+/*
+ * Define TB_NO_THREADS if your program is not multi-threaded.
+ */
+/* #define TB_NO_THREADS */
+
+/*
+ * Define TB_NO_HELPER_API if you do not need the helper API.
+ */
+/* #define TB_NO_HELPER_API */
+
+/*
+ * Define TB_NO_HW_POP_COUNT if there is no hardware popcount instruction.
+ *
+ * Note: if defined, TB_CUSTOM_POP_COUNT is always used in preference
+ * to any built-in popcount functions.
+ *
+ * If no custom popcount function is defined, and if the following
+ * define is not set, the code will attempt to use an available hardware
+ * popcnt (currently supported on x86_64 architecture only) and otherwise
+ * will fall back to a software implementation.
+ */
+/* #define TB_NO_HW_POP_COUNT */
+
+/***************************************************************************/
+/* SCORING CONSTANTS                                                       */
+/***************************************************************************/
+/*
+ * Fathom can produce scores for tablebase moves. These depend on the
+ * value of a pawn, and the magnitude of mate scores. The following
+ * constants are representative values but will likely need
+ * modification to adapt to an engine's own internal score values.
+ */
+#define TB_VALUE_PAWN 100  /* value of pawn in endgame */
+#define TB_VALUE_MATE 32000
+#define TB_VALUE_INFINITE 32767 /* value above all normal score values */
+#define TB_VALUE_DRAW 0
+#define TB_MAX_MATE_PLY 255
+
+/***************************************************************************/
+/* ENGINE INTEGRATION CONFIG                                               */
+/***************************************************************************/
+
+/*
+ * If you are integrating tbprobe into an engine, you can replace some of
+ * tbprobe's built-in functionality with that already provided by the engine.
+ * This is OPTIONAL.  If no definition are provided then tbprobe will use its
+ * own internal defaults.  That said, for engines it is generally a good idea
+ * to avoid redundancy.
+ */
+
+/*
+ * Define TB_KING_ATTACKS(square) to return the king attacks bitboard for a
+ * king at `square'.
+ */
+/* #define TB_KING_ATTACKS(square)          <DEFINITION> */
+
+/*
+ * Define TB_KNIGHT_ATTACKS(square) to return the knight attacks bitboard for
+ * a knight at `square'.
+ */
+/* #define TB_KNIGHT_ATTACKS(square)        <DEFINITION> */
+
+/*
+ * Define TB_ROOK_ATTACKS(square, occ) to return the rook attacks bitboard
+ * for a rook at `square' assuming the given `occ' occupancy bitboard.
+ */
+/* #define TB_ROOK_ATTACKS(square, occ)     <DEFINITION> */
+
+/*
+ * Define TB_BISHOP_ATTACKS(square, occ) to return the bishop attacks bitboard
+ * for a bishop at `square' assuming the given `occ' occupancy bitboard.
+ */
+/* #define TB_BISHOP_ATTACKS(square, occ)   <DEFINITION> */
+
+/*
+ * Define TB_QUEEN_ATTACKS(square, occ) to return the queen attacks bitboard
+ * for a queen at `square' assuming the given `occ' occupancy bitboard.
+ * NOTE: If no definition is provided then tbprobe will use:
+ *       TB_ROOK_ATTACKS(square, occ) | TB_BISHOP_ATTACKS(square, occ)
+ */
+/* #define TB_QUEEN_ATTACKS(square, occ)    <DEFINITION> */
+
+/*
+ * Define TB_PAWN_ATTACKS(square, color) to return the pawn attacks bitboard
+ * for a `color' pawn at `square'.
+ * NOTE: This definition must work for pawns on ranks 1 and 8.  For example,
+ *       a white pawn on e1 attacks d2 and f2.  A black pawn on e1 attacks
+ *       nothing.  Etc.
+ * NOTE: This definition must not include en passant captures.
+ */
+/* #define TB_PAWN_ATTACKS(square, color)   <DEFINITION> */
+
+#endif