Bishop trap on A/H 3/6 squares
Also consider the squares A3, H3, A6, H6. No measurable elo impact expected. But need to check for regression still. Diidn't have time to do proper testing (going on holiday to Langkawi in 1h). So just a quick one:

2000 games in 4"+0.04"
559-540-901 [50.5%] LOS=71.7%

signature = 7278567