Firstly, if you want a readable deadlock graph, turn traceflag 1204 off and turn traceflag 1222 on (or read the deadlock graph from the system health extended events session)
The deadlock graph produced by traceflag 1204 is a pain to read and missing important information.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability