Add Diamond Coach to your device
iPhone / iPad: Open this link in Safari. Open the Share menu, choose Add to Home Screen, enable Open as Web App if shown, then tap Add. If the option is missing, look under Edit Actions.
Android: Open in Chrome. Tap Install app here when offered, or use the browser menu’s Install app / Add to Home screen option.
Windows / Mac: Open in Chrome or Edge and use Install app here or the browser’s install icon/menu. In Safari on a supported Mac, choose File → Add to Dock.
Open once while connected and wait for “Ready for offline use” on the device you’ll take to the field. All diagrams and animations are included. External reference links need an internet connection. Browser storage can be cleared by the device; reconnect if offline access is lost.
Home plate at the bottom · schematic, not to scale
Tap a player for their assignment. Play or scrub the timeline to see the rotation.
Runner reads & defensive decision
Every player has a job
Walk it through at practice
- Announce the runners, outs and intended throw before the rep.
- Have every player point to their destination and say their job.
- Roll or hit the ball. Freeze when the fielder secures it; check base coverage, the throwing line and backups.
- Repeat at game speed. Change the throw if the runner or ball changes the play.
Our teaching system
These are suggested team assignments, not league rules. Agree on one system before practice.
- To second: SS cuts from left/centre; 2B cuts from right. The other middle infielder covers the bag.
- To third: SS relays; 3B stays at the bag; 2B covers second.
- To home: 1B is the cutoff. From left field, 2B covers first, SS covers second and 3B stays at third. From centre/right, 2B covers second and SS supports the middle.
- Deep gaps: this board teaches one relay, adjusted to throwing range. Double relays need a separate practiced rotation.
Cutoff: an infielder on the throw line who may let a throw pass or redirect it. Relay: a player who receives and immediately throws onward. Backup: a player beyond the receiving target on the projected throw line.
Runner guidance: Little League · Coaching the bases and runner rules. Check your league’s rules on steals, leads, appeals and infield fly. Runner paths illustrate an attempted advance, not a guaranteed result. This library covers base occupancy, outs and common play families; ball speed, score, runner speed and misplays still require a coach’s judgement.
Teaching principles: Coaching Youth Baseball · game-day coaching. The specific rotations here are an original suggested coaching system. Keep receiving players out of the runner’s path until a play permits a tag; adjust backups to the actual throw and available space.