An excess heat of 100 W/cc level, 1.7 times the input power in average, and 160 MJ in total was observed for about two months by the L-H mode pulse electrolysis of a D2O/Pd cell with plane-symmetric configuration of D-loading into the Pd cathode. Very weak neutron emission was detected to show an inversely proportional correlation to the excess heat variation. To explain the observed anomalous results including our past results, the theoretical model of competing multibody deuteron fusions in transient PdDx lattice has been extended. It can explain most experimental results. Cold fusion may be the multibody fusion of hydrogen isotopes in the metal lattice.
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