 To break even under "sen-ai-sen" means to win (for example) 65% of games with Black, and 20% of games with White; or two games out of three with Black, and one game in six with White.A steady player, under the old style of opening, would aim to win games with Black more frequently; a less consistent but more aggressive player would expect better success in claiming some wins with White with ambitious strategies to cause confusion on the board.