I heard with great sadness that Dan Meinking passed away, Friday Nov. 23 at age 52. He was a strong american composer, FIDE Master in Chess Composition, an innovator and a great friend. He was also the soul of this forum. A couple of days before death, he discovered a matrix named "moved Zeller trap" (see the topic Overall Records with Promoted Force). May he rest in peace. I opened this topic to commemorate Dan in our manner: posting problems with dedication.
Paul Rãican
In the memory of Dan Meinking

ser-sF110 C+ (by Winchloe)
1.Kc1-d1 2.Kd1-e1 3.Ke1-f1 4.Kf1-g1 5.Kg1-h2 6.Kh2-h3 7.Kh3-h4 8.Kh4-h5 9.Kh5-h6 10.Kh6-h7 11.Kh7-g8 12.Kg8-f8 13.Kf8-e8 14.Ke8-d8 15.Kd8-c7 16.Kc7-d6 17.Kd6-c5 18.Kc5*b4 19.Kb4-c5 20.Kc5-d6 21.Kd6-c7 22.Kc7-d8 23.Kd8-e8 24.Ke8-f8 25.Kf8-g8 26.Kg8-h7 27.Kh7-h6 28.Kh6-h5 29.Kh5-h4 30.Kh4-h3 31.Kh3-h2 32.Kh2-g1 33.Kg1-f1 34.Kf1-e1 35.Ke1-d1 36.Kd1-c1 37.Kc1*b1 38.Kb1-c1 39.Kc1-d1 40.Kd1-e1 41.Ke1-f1 42.Kf1-g1 43.Kg1-h2 44.Kh2-h3 45.Kh3-h4 46.Kh4-h5 47.Kh5-h6 48.Kh6-h7 49.Kh7-g8 50.Kg8-f8 51.Kf8-e8 52.Ke8-d8 53.Kd8-c7 54.Kc7-d6 55.Kd6-c5 56.Kc5-b4 57.Kb4*a3 58.Ka3-b4 59.Kb4-c5 60.Kc5-d6 61.Kd6-c7 62.Kc7-d8 63.Kd8-e8 64.Ke8-f8 65.Kf8-g8 66.Kg8-h7 67.Kh7-h6 68.Kh6-h5 69.Kh5-h4 70.Kh4-h3 71.Kh3-h2 72.Kh2-g1 73.Kg1-f1 74.Kf1-e1 75.Ke1-d1 76.Kd1-c1 77.Kc1-b1 78.Kb1*a1 79.Ka1-b1 80.Kb1-c1 81.Kc1-d1 82.Kd1-e1 83.Ke1-f1 84.Kf1-g1 85.Kg1-h2 86.Kh2-h3 87.Kh3-h4 88.Kh4-h5 89.Kh5-h6 90.Kh6-h7 91.Kh7-g8 92.Kg8-f8 93.Kf8-e8 94.Ke8-d8 95.Kd8-c7 96.Kc7-d6 97.Kd6-c5 98.Kc5-b4 99.Kb4*c3 100.Kc3*d3 101.Kd3*e3 102.Ke3-f2 103.e2-e4 104.e4*d5 105.d5-d6 106.d6-d7 107.d7-d8=R 108.Rd8-d6 109.Rd6*b6 110.Rxe6+ K~ F
This problem was checked by Eric Huber with Winchloe, ser-s Clouage absolu et effectif 110. It is not a record of length (for 19 units we have 117 moves), but it shows a R promotion followed by a R sacrifice.