cancel reduction upon mate null threat (3212531)
Try a cross breed version between Stockfish and DiscoCheck here.

Step 1: passed
 * 5"+0.05"
 * (elo0, elo1) = (-3.5, +1.5)

Step 2: running
 * 10"+0.05"
 * (elo0, elo1) = (-2.5, +2.5)
Merge branch 'master' into threat