His Kifu (record of a game of shogi) of Shogi (Japanese Chess) has been preserved, which indicates that his level is estimated on the same level as the present amateur high-ranking shogi player (assuming that the Kifu recorded the games played by the real ability of Ieharu TOKUGAWA himself).
将棋は棋譜が残っており、（もし棋譜が純粋に徳川家治自身の実力のみで指されたと仮定すれば）現在のアマ高段者レベルだったと推定される。