Yes, using cpaf instead of cmpaf does work, but only if it used once. (cpaf)2cB only covers a subset of the moves that (cmpaf)2cB covers. Remember, the p and a modifiers exclude the m modality if only c and/or d are specified in the modifiers immediately before it, per their definitions. Thankfully, this problem can easily be solved by writing the missing legs separately, yielding B(cpaf)2cBcafpafcBpafcafcB. Longer for sure, but it won't have the same search explosion problem, at least for the (cpaf)2 part. The other two multi-leg parts may have search explosions since paf is (usually) equivalent to mpaf (which can lead to the same problem as before), but they will be much more subtle explosions since paf is only used once.
I will update the diagram at the page I used to demonstrate the Suzumu Shogi BadZone bug (which can be found here) to include this bug, for future reference.
Yes, using cpaf instead of cmpaf does work, but only if it used once. (cpaf)2cB only covers a subset of the moves that (cmpaf)2cB covers. Remember, the p and a modifiers exclude the m modality if only c and/or d are specified in the modifiers immediately before it, per their definitions. Thankfully, this problem can easily be solved by writing the missing legs separately, yielding B(cpaf)2cBcafpafcBpafcafcB. Longer for sure, but it won't have the same search explosion problem, at least for the (cpaf)2 part. The other two multi-leg parts may have search explosions since paf is (usually) equivalent to mpaf (which can lead to the same problem as before), but they will be much more subtle explosions since paf is only used once.
I will update the diagram at the page I used to demonstrate the Suzumu Shogi BadZone bug (which can be found here) to include this bug, for future reference.