かって
selfish, self-centered
Playing every round for himself and nobody else at the table. A cutter かって, and enough of it now: かって.
勝手に means 'without asking anyone'. 勝手に決めた, decided it on his own.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.