Table 2. Non-cooperative strategies: average survival time in 100 evolutionary games (for details of strategies see S 2: IPD strategies employed).

Strategy	Without weapon use (generations) (p = 0.00)	With weapon use (generations) (p = 0.05)	Change (generations)
AllD	8.92	3.01	−5.91
NP	18.37	6.33	−12.04
RP	34.72	17.93	−16.79
Adaptive	24.41	10.67	−13.74
Prober	8.10	2.93	−5.17
STFT	12.97	5.02	−7.95
Handshake	13.55	3.58	−9.97
Fortress 3	7.90	3.48	−4.42
Fortress 4	9.41	3.75	−5.66
HM	12.43	4.42	−8.01
Rand	12.03	4.57	−7.46
Total	162.81	65.69	−97.12

Note: Average change in performance is −97.12/11 = −8.8.