" - here it means that this move would give the White player such an advantage, that would be very difficult for the other player to catch up/win the game.
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Blue JayStoyanov: In the phrase above you need the preposition "for" at the end. An advantage in force that cannot be compensated for. Even so, I think "An advantage in force that cannot be overcome" sounds much better and is more common.I agree. Insurmountable is a strong, emphatic word. Notice how in the original passage it talked about "an insurmountable ... advantage