R: 1. Lb1-a2 Kb2-a3 2. Tb4-b6 Ka3-b2 3. Tb6-a6 Kb2-a3 4. Ta4-b4 Kc1-b2 5. Tb4-b6 Kd1-c1 6. Ta2-a4 Kc1-d1 7. Ta4-b4 Kd1-c1 8. Tb2-a2 Ke1-d1 9. La2-b1 Ke2-e1 10. Tb1-b2 Ta6-a7 11. Th1-b1 Tb6-a6 12. Lb1-a2 Ta6-b6 13. Ta2-a4 Ta7-a6 14. Tb2-a2 Ta6-a7 15. La2-b1 Tb6-a6 16. Tb1-b2 Tb4-b6 17. Tc1-b1 Ta4-b4 18. Lb1-a2 Ta2-a4 19. Td1-c1 Tb2-a2 20. La2-b1 Tb1-b2 21. Tf1-d1 Te1-b1 22. Tg1-f1 Kd1-e2 23. Tf1-g1 Kc1-d1 24. Tg1-h1 Td1-e1 25. Te1-f1 Kb2-c1 26. Te6-e1 Te1-d1 27. Th1-g1 Te4-e1 28. Te1-h1 Kc1-b2 29. Te3-e1+ Kd1-c1 30. Kg8-h8 Ke1-d1 31. Td3-e3+ Kf1-e1 32. Kf8-g8 Kg1-f1 33. Ke8-f8 Te1-e4 34. Te3-d3 Tf1-e1 35. Te1-e3 Kh1-g1 36. Tb1-e1 Tc1-f1 37. Tb2-b1 Td1-c1 38. Lb1-a2 Kg1-h1 39. Ta2-b2 Tc1-d1 40. Ta4-a2 Td1-c1 41. Tb4-a4 Tc1-d1 42. Tb6-b4 Td1-c1 43. Ta6-b6 Tc1-d1 44. Ta8-a6 Tf1-c1 45. Td8-a8 Tc8-c7 46. Te5-e6 Ta8-c8 47. Tc8-d8 Tb8-a8 48. Kd8-e8 Ta8-b8 49. Kc7-d8 Tb8-a8 50. Kb6-c7 Ta8-b8 51. Kb5-b6 c7-c6+

Cook: (Henrik Juel):
R: 1. Lb1-a2 Kb2-a3 2. Tb4-b6 Ka3-b2 3. Tb6-a6 Kb2-a3 4. Ta4-b4 Kc1-b2 5. Ta2-a4 Kd1-c1 6. Tb2-a2 Ke1-d1 7. La2-b1 Ke2-e1 8. Tb1-b2 Ta6-a7 9. Th1-b1 Ta7-a6 10. Lb1-a2 Ta6-a7 11. Tb4-b6 Ta7-a6 12. Ta4-b4 Ta6-a7 13. Ta2-a4 Ta7-a6 14. Tb2-a2 Ta6-a7 15. La2-b1 Tb6-a6 16. Tb1-b2 Tb4-b6 17. Td1-b1 Ta4-b4 18. Lb1-a2 Ta2-a4 19. Tg1-d1 Tb2-a2 20. La2-b1 Tb1-b2 21. Kg8-h8 Te1-b1 22. Kh8-g8 Kd1-e2 23. Kg8-h8 Kc1-d1 24. Kf8-g8 Td1-e1 25. Te1-g1 Kb2-c1 26. Te5-e1 Tb1-d1 27. Te1-h1 Kc1-b2 28. Te3-e1+ Kd1-c1 29. Td5-e5 Ke1-d1 30. Tc3-e3+ Kf1-e1 31. Ke8-f8 Kg1-f1 32. Te3-c3 Tf1-b1 33. Te1-e3 Kh1-g1 34. Tb1-e1 Kg1-h1 35. Tb2-b1 Kh1-g1 36. Lb1-a2 Kg1-h1 37. Ta2-b2 Kh1-g1 38. Ta4-a2 Kg1-h1 39. Tb4-a4 Kh1-g1 40. Tb6-b4 Kg1-h1 41. Ta6-b6 Kh1-g1 42. Ta8-a6 Kg1-h1 43. Td8-a8 Tc8-c7 44. Te5-d5 Ta8-c8 45. Tc8-d8 Kh1-g1 46. Kd8-e8 Kg1-h1 47. Kc7-d8 Kh1-g1 48. Kb6-c7 Kg1-h1 49. Kb5-b6 c7-c6+ 50. La2-b1

1. cxb6 d6 2. bxc5 Txb8#
1. La7 Lxa7 2. 0-0-0? Tb8#

Castling is impossible because, if black can still castle, the diagram position is draw due to the 50-move rule!
White captures: axb, bxc, exf. Black captures: hxg, gxf, exd, dxc. Promotions: a1=T, b1=T, h8=X. The position can only be unblocked by unpromoting White piece on h8. This can only be wRb5. wK must go to c6 to unpin wR. The journey is via g3, h2, e1, b2, & a3.The 50 white moves are: 34 by wK (screens on c8 [with careful step on a2 to let bB pass] then g8), 11 by wB6 (to e3 to exchange place with bB then screen on a7), 3 by wR (promotion on h8), 2 by wBa4.

Cook: R: 1. Lb1-a2 Db5-b6 2. Ta2-a3 Ka3-b4 3. Rb2-a2 Db4-b5 4. La2-b1 Dc3-b4 5. Tb1-b2 Kb2-a3 6. Th1-b1 Dd3-c3 7. Tb6-a6 Df1-d3 8. Tb4-b6 Kc1-b2 9. Ta4-b4 Kd1-c1 10. Lb1-a2 Ke2-d1 -11.Ra2-a4 Ra6-a7 -12.Rb2-a2 Rb6-a6 -13.Ba2-b1 Rb4-b6 -14.Rb1-b2 Dg1-f1 -15.Rf1-b1 Ra4-b4 -16.Bb1-a2 Ra2-a4 17.Kg8-h8 Rb2-a2 -18.Ba2-b1 Rb1-b2 -19.Kf8-g8 Re1-b1 -20.Ke8-f8 Kd1-e2 -21.Bb1-a2 Kc1-d1 -22.Ba2-b1 Kb2-c1 -23.Bb1-a2 Re2-e1 -24.Rd1-f1 Re1-e2 -25.Rc1-d1 Df1-g1 -26.Rd1-c1 De2-f1 -27.Rc1-d1 Rg1-e1 28.Rf1-c1 De1-e2 -29.Kf8-e8 Kc1-b2 -30.Ba2-b1 Kd1-c1 -31.Ke8-f8 Ke2-d1 -32.Kf8-e8 Db1-e1 -33.Ke8-f8 Db2-b1 -34.Rb1-f1 Df6-b2 -35.Rb2-b1 Dg5-f6 -36.Bb1-a2 Dh5-g5 -37.Ra2-b2 Dg5-h5 -38.Ra4-a2 Dh5-g5 -39.Rb4-a4 Dg5-h5 -40.Rb6-b4 Df5-g5 -41.Ra6-b6 Dg5-f5 -42.Ra8-a6 Dh5-g5 -43.Rd8-a8 Rc8-c7 -44.Ba2-b1 Ra8-c8 -45.Rb8-d8 Ra6-a8 -46.Kd8-e8 Rb6-a6 -47.Kc7-d8 Rb4-b6 -48.Kb6-c7 Ra4-b4 -49.Kb5-b6 c7-c6!