Stockfish 6 slow at an easy tactic?

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adumbrate

Never heard about Gull before. It could of been one of the best engines..

EscherehcsE

Quite a few of the lower tier engines on my PC found the move within several seconds. Those engines probably aren't doing the severe pruning that the newer engines are doing.

All on one thread
About 3 sec, unless otherwise noted

Anmon 5.75
Beowulf 2.4  (6 sec)
Cheng4 0.36 x64
Critter 1.6a x64
Delfi Trainer 5.4 (almost instantly)
Dragon 4.6  (5 sec)
HIARCS 13.2  (7 sec)
Houdini 1.5a x64
Mephisto Gideon Professional UCI  (almost instantly)
Naum 4.6 x64  (5 sec)
Nejmet 3.07  (8 sec)
Pro Deo 1.87
Quark 2.35  (11 sec)
Rebel 6.0 UCI
Rebel Century 2000 UCI  (almost instantly)
Ufim 8.02  (8 sec)
Yace 0.99.87  (almost instantly)
Zchess 2.00 London