Hi.  Here’s a shin-buster when opponent immediately pulls guard.  Not claiming this is a super-high percentage attack, but it is one of many moves that will make your opponent move their limbs in jerky (and sometimes panicked) ways to get it out of danger… and the less smoothly and less controlled they move, the more of an opportunity for higher probability setups (for guard passes, other leg attacks, etc) you can secure.  Not to mention: any player who has never experienced a shin-buster may simply have the reflex to tap, partially out of surprise.  Good luck, have fun.