If there is a red line in my chess then it must be that I try to avoid chance as much as possible. This can be seen e.g. in a reaction of Kara in which he expresses his surprise about my depth of preparation. In my article which games to analyze I explain in detail how I try to extract lessons from the analyses. Again I try to arm myself against haphazard repetitions. In my OTB-games you can clearly see an allergy for risks to avoid that the result depends too much on luck. For this I already once received right or wrong critique see Lintons reaction on the article Tactic.
However assuming that I always avoid risks is nonsense as I am e.g. no pragmatic player, see chessintuition part 2 or somebody never daring to play a gambit. Now I do admit that the balance clearly leans to prudence and especially playing economically. Playing economically was already once touched in a reaction of my article my most beautiful move. If I can choose between sacrificing material of which the complications are obscure and between (preferably without spending much reflection-time) a quiet continuation which still permits to maintain a position with some prospects then I choose invariably for the second option.
So it happened in round 5 against the British player Andrew Stone that I after a long reflection anyway didn't sacrifice my knight but preferred to retract it to f6. I imagine MNb will probably be shocked again if he sees that I once more chose for the retracting move but sacrificing somebody else's pieces is always easier.
After the game it took me a lot of effort to verify the piece-sacrifice but now I dare to state that it is fully correct. However I would not mention this if there was nothing special about. When I let the engines Houdini 2 and Stockfish 4 calculate on the critical position then none of them found the key-move even on my fastest PC. Something like that I hadn't encountered before with those programs. Was it still possible as human to find a tactical idea at the board which was beyond the horizon of the best engines?
Via the wikispace of testpositions for chess-engines I tried to find recent examples from the tournament-chess. However I didn't have much luck as everything which I checked was pretty quickly solved by my top-engines. E.g. also the testposition 201 out of the standard arasan testsuite. This is an extract from the game Hikaru Nakamura - Anish Giri played in the 2012 Fide Grandprix at Londen.
Therefore I also looked at some positions from older games which some testers use. One of them was a critical position of the famous game David Bronstein - Ljubomir Ljubjevic. I recently bumped by accident on this game when reading My great predecessors part 2.