A prized series composition

In "series" compositions, one side makes moves alone, alters the position in some fashion, and when its moves are completed, then the other side mates or stalemates, accordingly with the stipulation.

Today we will see a ser-s=198, that is a series inverse stalemate in 198 moves. The white plays 198 moves alone and in the last one the black plays and is forced to stalemate the wK. This composition was awarded with 1st prize in a ChessCafe.com tourney and is a world record in its category. (See the presentation with a Sherlock-Holmes-like story in page 5 of the document : http://www.chesscafe.com/text/puzzling54.pdf)
Four black Pawns have been promoted to bQ, bR, bR, bR. The wK has difficulty in moving around the chessboard with the assistance of the wB, but the wK is obstructive and the wB makes large rounds.
During the writing of the solution, we omit the moves which are easily deducted.

The composer, Arno Tüngler, is very succesful with very long compositions.

Problem-748 Arno Tüngler 1st Prize, ChessCafe.com 2013 Puzzler's Cup

4B3/2p1p3/2PqPr2/2r2Ps1/2Pr3b/p2PKp2/1r3s2/q5rk (7 + 15) ser-s=198

1.Bd7 6.Bc2 8.Kc3 9.Bb3 11.Ka4 22.Bb5 26.Kc8 35.Bd7 37.Ke8 48.Bf7 50.Kg7 51.Bg6 53.Kh5 64.Bg4 65.Kxh4 66.Kh5 77.Bg6 79.Kg7 80.Bf7 82.Ke8 93.Bd7 95.Kc8 104.Bb5 108.Ka4 119.Bb3 121.Kc3 122.Bc2 125.Kxf2 128.Kc3 129.Bb3 131.Ka4 142.Bb5 146.Kc8 155.Bd7 157.Ke8 168.Bf7 170.Kg7 171.Bg6 173.Kh5 184.Bg4 185.Kxg5 187.Kh3 198.Bg2+ Rgxg2/Rbxg2/fxg2=