var outcome: usize = undefined;
        switch (me) {
            1 => {
                outcome = if (opp == 1) 3 else if (opp == 2) 0 else 6;
            },
            2 => {
                outcome = if (opp == 1) 6 else if (opp == 2) 3 else 0;
            },
            3 => {
                outcome = if (opp == 1) 0 else if (opp == 2) 6 else 3;
            },
            else => unreachable,
        }

        // https://learningpenguin.net/2020/02/06/a-simple-algorithm-for-calculating-the-result-of-rock-paper-scissors-game/
        const outcome: usize = if (opp % 3 == me - 1) 6 else if (opp == me) 3 else 0;

        var me: usize = undefined;
        switch (outcome) {
            0 => { // lose
                me = if (opp == 1) 3 else if (opp == 2) 1 else 2;
            },
            3 => { // draw
                me = if (opp == 1) 1 else if (opp == 2) 2 else 3;
            },
            6 => { // win
                me = if (opp == 1) 2 else if (opp == 2) 3 else 1;
            },
            else => unreachable,
        }

        const me: usize = if (outcome == 6) (opp % 3) + 1 else if (outcome == 3) opp else ((opp + 1) % 3) + 1;