[Event "US Junior Invitational 1972"] [Site "Los Angeles"] [Date "1972.06.21"] [Round "3"] [White "Jacobs, Jon"] [Black "Chellstorp, Craig"] [Result "0-1"] [ECO "C99"] [Annotator "jon"] [PlyCount "114"] [EventDate "1972.06.21"] [EventCountry "USA"] [SourceVersionDate "2025.03.19"] {By move 25 I had an extra pawn and was well on the way to snuffing out Black's counterchances. Then the difference in our strenghts began to assert. I found myself gradually, inexorably outplayed. I rejected at least one draw offer, but by adjournment time Black, although still a pawn down, had enough counterplay (2 Bishops in an open position) that his chances were at least equal. I stayed up all night preparing various traps. To my chargin, Chellstorp's sealed move differed from the one that all my adjournment analysis started from. Upon resuming after adjournment, Chellstorp's pieces grew ever more active, until my position finally collapsed.} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 cxd4 13. cxd4 Nc6 14. Nb3 a5 15. Be3 a4 16. Nbd2 Nb4 17. Bb1 Bd7 ({If} 17... a3 {to prevent White's next move, then} 18. Qb3 Qa5 ({if} 18... axb2 19. Qxb2 {Stockfish accords White a decisive advantage in light of Black's difficulty defending b5 and e5}) 19. Rc1 $14) 18. a3 Na6 19. Bd3 Rac8 20. Qe2 Qb8 21. Rab1 Ne8 22. b3 axb3 23. a4 (23. Nxb3 $142) 23... Nec7 $2 ({Stockfish thinks Black should give go for} 23... bxa4 {, giving up the N for a pair of advanced passers:} 24. Bxa6 Rc3 25. Bd3 a3 26. Nc4 $16) 24. Rxb3 exd4 25. Bxd4 Nc5 26. Bxc5 dxc5 27. axb5 Ne6 28. Bc4 Nf4 29. Qe3 Qd6 30. h4 Ne6 31. Qd3 $6 (31. Rd3 Qc7 32. b6 Qb7 33. Rb1 {would expand White's already crushing advantage}) 31... Nd4 32. Nxd4 cxd4 33. Nf3 $6 (33. b6 $142 Rb8 34. b7) 33... Kh8 34. Rbb1 Bg4 35. Nxd4 Qc5 36. Bd5 Bxh4 37. g3 Bd8 38. Nc6 $2 (38. Rec1 {forcing a trade of Q for 2 rooks was the right course. Black's 2 bishops are outweighed by White's passed pawn and well coordinated pieces. Play could continue} Qxc1+ 39. Rxc1 Rxc1+ 40. Kg2 Rd1 41. Qa3 $1 Kg8 42. Nc6 Rb1 43. Ne5 Bh5 44. Nd7 Re8 45. Qa8 Rb2 46. Qc6 {with b6 to come}) 38... Bb6 39. Qd2 Rce8 40. Rb3 $6 (40. Rec1 $142 {, chasing Black's Q off the dangerous diagonal}) 40... f5 41. e5 {Notwithstanding White's past missteps, Stockfish still sees White better by six(!) pawn-equivalents here} f4 42. gxf4 $2 (42. Rc1 $1 {was still the right idea. The black Q is trapped, and after the desperate} fxg3 43. Rxc5 gxf2+ 44. Kf1 Bxc5 45. Qc1 Ra8 46. Rc3 Ba3 47. Qb1 {White continues to have all the key squares covered (such as h3 and f1 in case of ...Be2+)}) 42... Rf5 43. Kg2 $4 {Finally White cracks, misstepping badly enough to erase his advantage} Rxf4 44. f3 Qf8 45. Re2 $4 (45. Rh1 $11) (45. Kg3 Bc8 $17) 45... Bh5 $4 {Now it's black's turn to overlook a decisive continuation} (45... Qf5 $1 {was killing.}) ({Likewise} 45... Be6 $1 {The point is that after} 46. Kg3 (46. Bxe6 Rxe6 {lifts Black's other rook into the attack}) 46... Bxd5 47. Qxd5 $2 Qf5 {the white K can escape the coming checks on the g and h files only by returning an Exchange on e3. But his king still won't evade the attack: Stockfish sees forced checkmate in at most 18 moves from that position.}) 46. Kg3 Ra4 $13 47. Be4 Qc5 48. Re1 Rea8 $2 49. Rb2 $2 (49. Rc3 $1 Qf8 50. Qg5 $1 {would all but force the deadly weakening ...g6, since} {retreating the bishop would fail to Bxh7!. For example,} Bf7 51. Bxh7 Kxh7 52. Ne7 g6 53. Rh1+ Rh4 54. Rxh4+ Kg7 55. Qf6#) 49... Ra1 $2 50. Rbb1 $4 (50. Rc2 $1 Qf8 51. Rxa1 Rxa1 52. Qd6 {forces the queens off, after which White's passed pawn will decide}) 50... R1a2 $2 $11 ({Far better was to do it with the other rook.} 50... R8a2 $19 {He needn't fear} 51. Rxa1 Rxd2 52. Ra8+ Bd8 53. Nxd8 Qxe5+ {forcing checkmate}) 51. Rb2 Rxb2 52. Qxb2 Bf7 53. Bb1 Bg8 54. Kg2 $2 Rf8 $2 ({This time Black's winning shot was truly hard to see:} 54... Bd5 $1 {What's so special about that? Can't White reply with} 55. Qc2 {threatening both mate on h7 and trading queens? Yes, but then comes} Ra2 $3 {and wins!}) (54... Ra3 {also wins:} 55. Kg3 Qf8 56. Qe2 Be3) 55. Rf1 $4 (55. Qc2 {maintains the balance, since} Qxb5 $2 56. Ne7 g6 57. Nxg6+ hxg6 58. Rh1+ {leads to checkmate}) 55... Qe3 $19 56. Qc1 Qe2+ 57. Kg3 Be3 0-1