What if one harmless chess move turned into one of Ireland’s most haunting crimes? In January 2014, a quiet night in Castleknock, Dublin spiraled into tragedy when researcher Tom O’Gorman was killed by his lodger Saverio Bellante, an Italian man lost in delusion. This isn’t a tale of monsters — it’s a true story about kindness, mental illness, and the moment reason broke. Through verified Irish court reports and psychiatric testimony, this article retraces the chess game that