This study resembles the previous one but with Black’s queen positioned on a5 instead of a2. This changes the analysis in significant ways. Once more White’s bishop is attacked once and defended only once, since the knight on d2 remains pinned. But this time that knight on d2, rather than the rook on b1, becomes the other offensive focus for Black. He attacks the knight twice, with his bishop and with the queen behind it. The knight appears to be guarded twice, by its king and queen. But a king is a suspect defender; it cannot recapture on a square that remains under attack. And the queen has responsibilities elsewhere, as we have seen. So the knight only seems to be protected twice; perhaps it would be more accurate to say it is protected one and a half times, since the queen that defends it is stretched thin. In this case either piece it protects can be taken first:

(a) Black can play 1. ...BxN+. You might suppose that White would reply 2. QxB, threatening to take Black’s loose queen with his own; Black replies 2. ...QxQ, and after White’s recapture 3. KxQ, Black has 3. ...NxB+, winning a piece. But Black has better in reply to 2. QxB: the delightful 2. ...NxB+—which, when so played a move earlier, is a knight fork of White's king and queen. The priority of check requires White to move his king and lose his queen to NxQ a move later. White’s better reply to 1. ...BxN is just to move his king to e2 where it can protect his bishop and limit his losses to a piece.

Or (b) Black also can begin with 1. ...NxB+. Now if White recaptures with 2. QxN, Black has 2. ...BxN and again wins a piece. If White moves his king instead of playing QxN, Black has NxNd2 on the next move.