Length of chain does not matter, it is total amount of work (listed as
log2_work in debug.log file) done on it that matters. Put differently:
99 blocks mined at difficulty 1
1 block mined at difficulty 100 <--- this chain wins
TRC hard-forked at block 175,000 but
last checkpoint is still at block 110,197 which means attacker still has coins he generated during attack.
Given that he also still posses massive hashrate, much more than 51%, he can still double-spend his coins, orphan anyone else blocks and so on.
So, does 101 blocks mined at difficulty 1 win over 1 block at difficulty 100?