ChessBomb upgrades analysis engine

Until now, the automatic analysis on ChessBomb.com was provided by the Rybka 2.2n2 engine. The time has come, however, to replace it with a better one. We evaluated several of the current top engines, according to the following criteria:

• playing strength
• compatibility with our infrastructure
• clear legal status

Our final choice is Stockfish 1.6.3. It is currently the second strongest unambiguously legal chess engine, beaten slightly only by Rybka 3. However, Stockfish can utilize the resources of our analyzing platform better than Rybka, gaining a few more ELO points in the process.

In the end, we estimate that this change adds about 150 ELO points to the ChessBomb analysis strength. The improvement is most obvious in endgames.