It was not knock at you. As I skipped through the game I too thought now
is the time to castle, then OOPS the e-pawn goes.
I added: ".....but that's just note oversight, easily done."
You are right 13.Nxf6+ does give Black loads of play. Perhaps
FEN
r2qk2r/1b2bpp1/p3pn1p/1pp5/3nNB2/P2P1N1P/1PP1BPP1/R2QK2R w KQkq - 0 1
[FEN "r2qk2r/1b2bpp1/p3pn1p/1pp5/3nNB2/P2P1N1P/1PP1BPP1/R2QK2R w KQkq - 0 1"] 1. Nxd4 cxd4 2. Nxf6+ Bxf6 3. Bf3 Bxf3 4. Qxf3 O-O {Now I'd have a think about things prompted by that backward c-pawn which gives Black a ready made plan. . Do I castle and hang on or g4 to create a distraction or Qe2/Qg3 with Be5 ideas. (passive or active defence Robbie.) Decisions.}
[FEN "r2qk2r/1b2bpp1/p3pn1p/1pp5/3nNB2/P2P1N1P/1PP1BPP1/R2QK2R w KQkq - 0 1"] 1. Nxd4 cxd4 2. Bf3 {Just want to know what could happen after Bf3.} 0-0 {Black better plays Nxe4, because of the following discovered attack.}3. Nxf6+ Bxf6 4. Bxb7 Ra7 5. Qf3
FEN
r2qk2r/1b2bpp1/p3pn1p/1pp5/3nNB2/P2P1N1P/1PP1BPP1/R2QK2R w KQkq - 0 1
It was not knock at you. As I skipped through the game I too thought now
is the time to castle, then OOPS the e-pawn goes.
I added: ".....but that's just note oversight, easily done."
You are right 13.Nxf6+ does give Black loads of play. Perhaps
[pgn]
[FEN "r2qk2r/1b2bpp1/p3pn1p/1pp5/3nNB2/P2P1N1P/1PP1BPP1/R2QK2R w KQkq - 0 1"]
1. ...[text shortened]... traction or Qe2/Qg3 with Be5 ideas. (passive or active defence Robbie.) Decisions.}[/pgn]
FEN
r2qk2r/1b2bpp1/p3pn1p/1pp5/3nNB2/P2P1N1P/1PP1BPP1/R2QK2R w KQkq - 0 1
[FEN "r2qk2r/1b2bpp1/p3pn1p/1pp5/3nNB2/P2P1N1P/1PP1BPP1/R2QK2R w KQkq - 0 1"] 1. Nxd4 Nxe4 {Another possibility to consider?} 2. dxe4 {Gotta think about White moving his knight - see later!} cxd4 3. Bf3 {3. Bd3 = BIG pawn} O-O 4. O-O {Black is OK here, isn't he?}
FEN
r2qk2r/1b2bpp1/p3pn1p/1pp5/3nNB2/P2P1N1P/1PP1BPP1/R2QK2R w KQkq - 0 1
[FEN "r2qk2r/1b2bpp1/p3pn1p/1pp5/3nNB2/P2P1N1P/1PP1BPP1/R2QK2R w KQkq - 0 1"] 1. Nxd4 Nxe4 2. Nxe6 {Threatening the Queen - see the line above} Qa5+ 3. Bd2 Qxd2+ 4. Qxd2 Nxd2 5. Nc7+ Kf8 6. Nxa8 Bxa8 7. Kxd2 Bxg2 {This is looking good for White now. Improvement for Black, anyone?}
Poor DR85 we are putting his game through the mangle.
I'm seeing (or not seeing is a better description) all kinds of varitions
that I never suspected where in there.
I'm all chess'd out. Need to recharge, see you on Monday.