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[Uri Blass]

Note that I simply reduce depth after promotion(and reduce more if the promotions happened in pawn endgame) but I have no rule not to extend checks after promotion.

I added this rule later after the rule of not extending checks that gives big advantage.

Inspite of it I think that not extending when there is a big advantage is a good idea not only for promotions because you can get a big advantage by winning a lot of material in some line in the search without promotion and I think that when the better side has a big advantage it is stupid to extend checks of the better side and it is better to spend time on other lines.