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Two of the break surfaces look like fatigue failure. Smooth beach then an area of rapid crack propagation. Hard to imagine the rod nuts could have backed off without the piston running into the head, especially with that high compression ratio. My vote is bad or over-tightened bolt(s) on that rod. Could have been just one, as soon as it went the other would be overstressed and fail. If so, only one bolt would show fatigue, the other should show ductile failure. If two clean breaks, then two bad or over-tightened bolts, breakage of one hastening crack propagation of the other.
Dan
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