"Even at lower Elo ranges like 1200-1400, you're 4-5% more likely to win if you have the only bishop pair. 1200 Elo players don't know how to take advantage of having the bishop pair, and yet it helps them win all the same [...] A 1000-1200 Elo player is only about 8% more likely to win when up two minors for a rook."
Though
"Even at lower Elo ranges like 1200-1400, you're 4-5% more likely to win if you have the only bishop pair. 1200 Elo players don't know how to take advantage of having the bishop pair, and yet it helps them win all the same [...] A 1000-1200 Elo player is only about 8% more likely to win when up two minors for a rook."