What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) The glider center main gear remained intentionally extended while on tow; however, after release, the pilot neglected to retract the gear. After three hours of flight, the pilot returned to trk. Upon entering the pattern for landing, the pilot went through a landing checklist and at the "undercarriage" step inadvertently retracted the center main wheel. The glider landed with the center main gear in the retracted position.
As the FAA filed it
(-23) THE GLIDER CENTER MAIN GEAR REMAINED INTENTIONALLY EXTENDED WHILE ON TOW; HOWEVER, AFTER RELEASE, THE PILOT NEGLECTED TO RETRACT THE GEAR. AFTER THREE HOURS OF FLIGHT, THE PILOT RETURNED TO TRK. UPON ENTERING THE PATTERN FOR LANDING, THE PILOT WENT THROUGH A LANDING CHECKLIST AND AT THE "UNDERCARRIAGE" STEP INADVERTENTLY RETRACTED THE CENTER MAIN WHEEL. THE GLIDER LANDED WITH THE CENTER MAIN GEAR IN THE RETRACTED POSITION.