[TimM]

xorbie:

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16...d4
17. Qf3 Re1
18. Rd1 Ne4

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19.Bb2 is bad (19...Ng5!) but he has 19.Be3 winning our d-pawn because of the pin against our queen.

Strega:

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Two pawn islands vs four, ouch... could be bad.

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Yeah but one of our islands is a passed extra pawn that will be hard to win back. And we have alternatives too.

Stephen H:

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What happens after
16 ... d4
17 Qf3 Qd5

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Both of those lines after 18.Qxd5 and 18.Rd1 look good for white. Our d-pawn is very weak. If we do play d4 it needs to give us something very quickly or we will just lose that pawn. If we can't get his queen off that f3 square shielding the king it's hard to do anything that's worth the loss of this pawn. He just has to watch out for Ne4-g5 but that's not hard to prevent.

aaronk56:

[ QUOTE ]
16...d4
17. Qf3 Re8
18. Rd1 Nd5

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19.Rxd4