noun
playing on equal terms; no handicap
Shogi term for a game where neither player receives a handicap, such as when both are of similar strength or when playing a '平手' (even game).
See also: 平手
今日は対馬で指しましょう。
Let's play on equal terms today.
noun
being evenly matched
Shogi term describing a situation where the players are of comparable strength, often resulting in a game without handicaps.
あの二人は実力が対馬だ。
Those two are evenly matched in ability.
平手 specifically refers to an even game without handicaps, while 対馬 can also describe the state of being evenly matched.
From 対 (opposite, equal) and 馬 (horse, a shogi piece), referring to a game where both sides start with equal pieces.