- about 80-100 Elo stronger
- this release's theme is improving search
- implemented UCI command 'stop'
- added a separate table for principal variation
- added killer heuristic to improve move ordering
- extended search when current position is in check
- improved time-control; in particular zurichess uses more time when there are fewer pieces on the boardhttps://bitbucket.org/brtzsnr/zurichess/downloads