constexpr U64 RIGHT_MASK = 0x7F7F7F7F7F7F7F7FULL;
constexpr U64 LEFT_MASK = 0xFEFEFEFEFEFEFEFEULL;
inline bool GameState::hasPlayerWon(const bool player) const
{
    if (player)
    {
        const U64 defended_once = ((boards[0] >> 7) & LEFT_MASK) | ((boards[0] >> 9) & RIGHT_MASK);
        const U64 defended_twice = ((boards[0] >> 7) & LEFT_MASK) & ((boards[0] >> 9) & RIGHT_MASK);

        const U64 attack_right = ((boards[1] << 7) & RIGHT_MASK);
        const U64 attack_left = ((boards[1] << 9) & LEFT_MASK);
        const U64 attack_up = (boards[1] << 8) & ~boards[0];

        const U64 attacked_once = attack_right | attack_left | attack_up;
        const U64 attacked_twice = (attack_right & attack_left) | (attack_right & attack_up) | (attack_left & attack_up);
        const U64 attacked_thrice = attack_right & attack_left & attack_up;

        return ((attacked_once & ~defended_once) | (attacked_twice & ~defended_twice) | (attacked_thrice)) & 0xFFFF000000000000ULL;
    }
    else
    {
        const U64 defended_once = ((boards[1] << 7) & RIGHT_MASK) | ((boards[1] << 9) & LEFT_MASK);
        const U64 defended_twice = ((boards[1] << 7) & RIGHT_MASK) & ((boards[1] << 9) & LEFT_MASK);

        const U64 attack_right = ((boards[0] >> 9) & RIGHT_MASK);
        const U64 attack_left = ((boards[0] >> 7) & LEFT_MASK);
        const U64 attack_up = (boards[0] >> 8) & ~boards[1];

        const U64 attacked_once = attack_right | attack_left | attack_up;
        const U64 attacked_twice = (attack_right & attack_left) | (attack_right & attack_up) | (attack_left & attack_up);
        const U64 attacked_thrice = attack_right & attack_left & attack_up;

        return ((attacked_once & ~defended_once) | (attacked_twice & ~defended_twice) | (attacked_thrice)) & 0xFFFFULL;
    }
}