CREATE TABLE table_15780718_6 (high_rebounds VARCHAR, score VARCHAR)

Name for the high rebounds when score is w 105 91 (ot)
SELECT high_rebounds FROM table_15780718_6 WHERE score = "W 105–91 (OT)"
SELECT "high_rebounds" FROM "table_15780718_6" WHERE "W 105–91 (OT)" = "score"