Cutting the tail of a dragon, and capturing it is valued nearly zero, (more precisely only the value of the move without the capture).
For Black at move 178 (last chance), M12 is valued 4.2, it is worth 40.0
Move at M12 threatens to attack M14
Move at M12 expands territory
Move at M12 connects N13 and J11
M12: 5.00 (followup) - threatens to capture M14
M12: 2.11 - change in territory
M12: 5.00 - total followup value, added 0.00 as territorial followup
M12: 2.32 - added due to followup (5.00) and reverse followup values (0.00)
M12: -0.21 - shape (shape values +1.00(1) -2.00(1), shape factor 0.952)
Move generation values M12 to 4.21
3. M12 4.22
mv 179 M11 for White is valued 0.11 !
pattern 'CC43'+3 matched at M11
Move at M11 threatens to attack O11
Move at M11 cuts L13 and J11
Move at M11 strategically or tactically unsafe
M11: 2.92 (followup) - threatens to capture O11
M11: not a safe move
M11: 0.01 - change in territory
M11: 2.92 - total followup value, added 0.00 as territorial followup
M11: 0.10 - cut/connect dame bonus
Move generation values M11 to 0.11