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Maybe you have used a lot of threads or maybe you have used a larger trasnposition table and you have changed it without sending and ucinewgame. The transposition table is allocated once the engine receive an ucinewgame. Are you using the tablebase or not? What are the commands that the gui sends to...

In Pedone I have removed razoring because it gives nothing and for this reason the margin is very difficult to tune.
Now I have a simpler code and one margin less to tune.

I have included in the executable the 4men syzygy tables.

I have just released a new version of my engine. This are the changes: Tuning Probcut Removed razoring Speed optimizations Store in the hash a move also in allnodes Fixed a bug with multipv Don't reduce a low depths LMP tuning SEE pruning tuning Use history ordering also in qsearch Clear killer at p...

With gcc you can use also -flto when compiling and when linking.

The elo increase given by singular extension is different from engine to engine. In my engine it gives about 10-20 elo after a lot of tries to find the best formula for the depth of the search to find if the move is singular. Stockfish uses depth/2 but in my engine was not optimal.

I've found the problem! In init_table there is this code: for (int t = 0; t < num; t++) { data = (uint8_t *)(((uintptr_t)data + 0x3f) & ~0x3f); ei[t].precomp->data = data; data += size[t][0][2]; if (split) { data = (uint8_t *)(((uintptr_t)data + 0x3f) & ~0x3f); ei[num + t].precomp->data = data; data...

Please, read carefully the code.

I've found the point, this is the original map_tb code: static void *map_tb(const char *name, const char *suffix, map_t *mapping) { FD fd = open_tb(name, suffix); if (fd == FD_ERR) return NULL; void *data = map_file(fd, mapping); if (data == NULL) { fprintf(stderr, "Could not map %s%s into memory.\n...

There are a lot of engines that uses internal tb, my engine would not be the only one. Stockfish uses a bitbase too.