PART 2 • Spotting mistakes: your personal chess coach
• Likewise, the “percentage” value means that the coach won't appear
unless the move you make causes your winning chances to change
by more than the specified value (in this case 1% as seen in the
illustration). This is a difficult value to understand properly, but it
basically means that the coach won't appear if your move loses
material when you're winning by a wide margin (if you're a Queen,
two Rooks, and a Bishop ahead, it won't usually matter if you blunder
away your Bishop – you still have more than enough of an advantage
to win the game). Likewise, if you're losing big, the coach won't pop
up either (if you're down three pieces, losing another pawn isn't likely
to change the result). Setting a low percentage value in conjunction
with a moderate Threshold value (typically 60 to 100) means that you'll
generally see the coach only when you make a bad mistake in a close
game.
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