Originally posted by David113
Release the position
Finally, a retro to test my mettle! And what a masterpiece of a problem - has to be Volet, Ceriani, or Fabel; all masters of the lengthy retro.
Black\'s two captures were made by the two doubled pawns. c2 and h2 have never left their file. To accommodate them, White needs the capture b2xc3, followed by two more caps to get the other 2P off the b-file, and the capture g2xh3.
The 3rd wR must have been the promoted h2 pawn. To avoid collision with bPh, a 5th capture, hxg, is needed. This accounts for all White captures.
So, the key question: How did the bK enter White\'s fortress? h2 never captured, so that route is out. As clogged as it looks, the only route left is the Queenside.
As if that wasn\'t intimidating enough, White cannot retract a2xb3 anytime soon. The long-term problem is the collision between the bK and wBb2. If wBb2 stays behind the pawn chain, bK can\'t cross b2, because the wB gives an impossible check. If it goes outside the pawn chain, White has to retract b4-b3, and the bK goes to a3, but then wB can\'t get back to c1 without once again administering an impossible check.
The only solution is to hide bK on a2 (!), move wB to c1, and provide a screen on b2, making ...Ka3 possible. OK, great, but what the hell to do with all of those White Rooks?!!
The answer is astounding.
Retract: 1.Ng3 Kg1 2.Nf1. Black now shuffles Kg1-g2 for a looong time, while White goes thru the sequence Ra4 Ba3 Qe1 Kb2 Rd1 Kc1 Rb2-b1 Kb2-a2 Bc1 Kb2 Ra2 and 18.Kb5.
Next, wQ is extracted: Ra4 Ba3 Rb1-a2 Rb1 Qc1-b2 Rd1 Qb1 Bc1 Rb2 Qa2 Rb1 Qb2 Ra2 and 35.Qa4.
Next, wN is released from the 1st rank. Kc4 Qb5 Ra4 Ba3 Rb1-a2 Rb1 43.Bc1.
wN redeploys: Ng3 Nf4 Nd4 Nf3 48.Ne1! Dangerously close to the 50 move rule, but precisely calculated. 48...Kf1 49.Ba3 Kg2 50.Rh1 f5! Just in time. And the point of the wN maneuver is revealed: Black only had to burn one P tempo while waiting for wR to cross over. He needs to save the other two P tempos for the other two White Rooks! Incredible.
51.Rh1 Kf1 52.Ng1 Ke1 bK heads west. wK will come in, Ng1 will leave, followed by Rh1 escaping via g1. All Rooks will be brought out using this method.
53.Rb2 allows bK to shuffle from c1 to d1. wK makes it to f1 on move 58. 59.Nf3 Rg1-g8-d8 Kg2 64.Kg3 Ke1 65.Ne5 Kf1 66.Kf4 Kg2 67.Nf3 Kf1 68.Ne1 69.Rb1 Kg2 70.Nf3 fxe6(+B) 71.Rh1 Kf1 72.Ng1. Lather, rinse repeat. Again, bK goes west. This time, wB saves time by shielding on f1, allowing Ng1 and Rh1 to leave, and bK doesn\'t need c1. This R might as well unpromote on g8, on move 65.
Ra4 is brought to c1 and out through g1 with the same technique. 89...Kg2 90.Nf3 e7 91.Rh1 Kf1 92.Ng1 and now the final act.
92...Ke1 93.Bg2 Kd1 94.Bf1 Ke1 95.Qg5 [there\'s confidence for ya - White clears the square a4 (!) in advance] 96.Nf3 97.Ne5 98.Nd3 Kc1 99.Nb2 [obviously the only piece that can shield] 99...Kb1 100.Nc4 Ka2 101.Ne3 Kb1 102.Nd1 Ka2 103.Bg2 104.Re1 105.Bf1 106.hxg2(+R) Finally, Black has a free piece to move. 106...Ka2 107.Ne3 108.Rb1 109.Bc1 Ka3 110.Rb2 Ka4 111.bxa2(+R) and now, with the bK freed, the rest is [comparatively] easy.
Whew! That was a lot of typing for something very few people will read. [But I can\'t help it; I\'m addicted to these damn things.]