This week's Canadian Tactic comes from the first round of the Calgary Invitational (Oct 29 - Nov 4, 2015). This 10-player RR gives six Canadians the chance to play for norms against titled players from other federations. In round 1 Canadian Gary Ng had White against the top seed, GM Enrico Sevillano from the USA. Black has spent a pawn and a few moves chasing White's Rook to its doom. Can White get any compensation, or is it time to resign?
[Event "2015 Calgary Invitational"]
[Site "?"]
[Date "2015.10.29"]
[Round "1"]
[White "Ng, Gary"]
[Black "Sevillano, Enrico"]
[Result "0-1"]
[ECO "A11"]
[WhiteElo "2182"]
[BlackElo "2463"]
[Annotator "John Upper"]
[SetUp "1"]
[FEN "r3kb1r/pp1q1ppp/8/8/P2pP2N/5QP1/bPnPP1BP/1RB2RK1 w kq - 0 18"]
[PlyCount "140"]
[EventDate "2015.10.29"]
18. b3 (18. d3 $1 Bxb1 ({White "threatens" to play Bd2, defending/saving the
Rb1.} 18...a5 $2 19. Bd2 Bxb1 20. Bh3 $1 (20. Rxb1 $13) 20... Qc7 21. Rxb1 $16 {
For the exchange White has a pawn, the B pair, a better center, and lead in
development.}) (18... Ne1 $3 {deflecting the Rf1 so there are no tactics
against f7.} 19. Rxe1 Bxb1 {With a pawn, the B-pair, better center and lead in
development White has obvious compensation for the exchange.}) 19. Bh3 $3 Qc7 (
19... Qxh3 $2 20. Qxf7+ Kd8 21. Bg5+ $18 {#4}) (19... Qe7 20. Qh5 $18 {with
too many threats, including Rxf7 and Qb5+.}) 20. Bf4 $16) 18... Bxb1 19. Bb2
Ba3 $15 ({Black's queenside minors look offside, but there's no reason to
avoid the obvious} 19... Ba2 $17 20. Bh3 $1 (20. e5 O-O-O $1 21. Rc1 d3 $8 {
/\...Bxb3}) 20... Qc7 $8 21. Rc1 Qb6 $1 {using ...d3+ to defend the Nc2}) 20.
Rxb1 Bxb2 21. Rxb2 Nb4 $15 22. e5 O-O 23. Qxb7 Qxb7 24. Bxb7 Rad8 25. d3 $15 {
With a an advantage that the GM eventually converted.} Rd7 26. Be4 Rc8 27. Kf2
Rc1 28. Ng2 Rc5 29. Ne1 Rxe5 30. Nc2 Nxc2 (30... f5 $1 31. Bf3 Nxc2 32. Rxc2 a5
{transposing to the game without allowing Bc5 in the next note.}) 31. Rxc2 f5
32. Bf3 (32. Bc6 $1 Rd6 (32... Rc7 $4 33. Bd5+ $18) 33. b4 $13) 32... a5 $1 33.
b4 (33. Bc6 $5 Rd6 34. Bb5 g5 {and Black should be able to get a R in on the
kingside.}) 33... axb4 34. Rb2 Kf7 35. Rxb4 Ke7 36. Bc6 Rd6 37. Rb7+ Kf6 38.
Bf3 Ra5 39. Rb4 Ke5 40. Rb7 Kf6 41. Rb4 g5 42. h3 Ke5 43. g4 fxg4 44. hxg4 Rda6
45. Bb7 Rxa4 46. Rb5+ Kf4 47. Bf3 R4a5 48. Rb8 Ke5 49. Rh8 h6 50. Re8+ Re6 51.
Rd8 Rd6 52. Re8+ Kf6 53. Rh8 Ke7 54. Rh7+ Kd8 55. Kg3 {Diagram [#]} Raa6 56.
Be4 Rd7 57. Rh8+ Kc7 58. Bf3 Rdd6 59. Rh7+ Kb6 60. Rb7+ Kc5 61. Rb8 Rab6 62.
Rc8+ Kb4 63. Rc4+ Kb3 64. Kf2 Ka3 65. Kg3 Rb2 66. Kf2 Kb3 67. Rc8 Rc2 68. Rb8+
Kc3 69. Ra8 Kd2 70. Ra4 Kc3 71. Ra8 Rf6 72. Rc8+ Kd2 73. Rh8 (73. Rd8 Rf4 74.
Rd6 h5 $19) 73... Rc1 74. Kg3 Rg1+ 75. Kh2 Re1 76. Rd8 Rxf3 77. exf3 Kxd3 78.
Kg3 Re6 $19 79. f4 Re3+ 80. Kf2 gxf4 81. Rd6 Rh3 82. Rf6 f3 83. Rc6 Ke4 84.
Re6+ Kf4 85. Rd6 Rh2+ 86. Ke1 Kg3 87. Rxd4 Rh1+ 0-1
