Source PGN: WorldChamp1984.pgn (48 games)
Definition: first ply where both sides have only the requested material class (plus kings).

Game 6 | Kasparov, Gary vs Karpov, Anatoly | Result 0-1 | ECO E15 | Endgame Rook(s)+Pawns
  Endgame begins after ply 79 (40.Rxb5, White move).
  Material at transition: W P3 N0 B0 R1 Q0 | B P3 N0 B0 R1 Q0
  Final material: W P0 N0 B0 R1 Q0 | B P1 N0 B0 R1 Q0
  Opening sequence (first 10 moves): 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.b3 Bb4+ 6.Bd2 Be7 7.Bg2 O-O 8.O-O d5 9.Ne5 c6 10.Bc3 Nfd7

Game 9 | Karpov, Anatoly vs Kasparov, Gary | Result 1-0 | ECO D34 | Endgame Minor+Pawns
  Endgame begins after ply 71 (36.exd4, White move).
  Material at transition: W P6 N1 B1 R0 Q0 | B P6 N1 B1 R0 Q0
  Final material: W P3 N1 B0 R0 Q0 | B P0 N0 B1 R0 Q0
  Opening sequence (first 10 moves): 1.d4 d5 2.c4 e6 3.Nf3 c5 4.cxd5 exd5 5.g3 Nf6 6.Bg2 Be7 7.O-O O-O 8.Nc3 Nc6 9.Bg5 cxd4 10.Nxd4 h6

Game 11 | Karpov, Anatoly vs Kasparov, Gary | Result 1/2-1/2 | ECO A30 | Endgame Rook(s)+Pawns
  Endgame begins after ply 72 (36...Rxd6, Black move).
  Material at transition: W P6 N0 B0 R1 Q0 | B P6 N0 B0 R1 Q0
  Final material: W P6 N0 B0 R1 Q0 | B P5 N0 B0 R1 Q0
  Opening sequence (first 10 moves): 1.Nf3 Nf6 2.c4 b6 3.g3 c5 4.Bg2 Bb7 5.O-O g6 6.b3 Bg7 7.Bb2 O-O 8.e3 e6 9.d4 Qe7 10.Nc3 Na6

Game 15 | Karpov, Anatoly vs Kasparov, Gary | Result 1/2-1/2 | ECO E15 | Endgame Minor+Pawns
  Endgame begins after ply 63 (32.Bxb7, White move).
  Material at transition: W P4 N1 B1 R0 Q0 | B P3 N1 B1 R0 Q0
  Final material: W P2 N1 B1 R0 Q0 | B P2 N1 B1 R0 Q0
  Opening sequence (first 10 moves): 1.Nf3 Nf6 2.c4 b6 3.d4 e6 4.g3 Ba6 5.b3 Bb4+ 6.Bd2 Be7 7.Bg2 O-O 8.O-O d5 9.cxd5 Nxd5 10.Nc3 Nd7

Game 19 | Karpov, Anatoly vs Kasparov, Gary | Result 1/2-1/2 | ECO D55 | Endgame Rook(s)+Pawns
  Endgame begins after ply 49 (25.Rxd5, White move).
  Material at transition: W P5 N0 B0 R2 Q0 | B P5 N0 B0 R2 Q0
  Final material: W P3 N0 B0 R1 Q0 | B P3 N0 B0 R1 Q0
  Opening sequence (first 10 moves): 1.Nf3 d5 2.d4 Nf6 3.c4 e6 4.Nc3 Be7 5.Bg5 h6 6.Bxf6 Bxf6 7.Qd2 Nc6 8.e3 O-O 9.Rc1 a6 10.Be2 dxc4

Game 21 | Karpov, Anatoly vs Kasparov, Gary | Result 1/2-1/2 | ECO D53 | Endgame Rook(s)+Pawns
  Endgame begins after ply 49 (25.axb5, White move).
  Material at transition: W P5 N0 B0 R2 Q0 | B P4 N0 B0 R2 Q0
  Final material: W P3 N0 B0 R2 Q0 | B P3 N0 B0 R2 Q0
  Opening sequence (first 10 moves): 1.Nf3 d5 2.d4 Nf6 3.c4 e6 4.Nc3 Be7 5.Bg5 h6 6.Bxf6 Bxf6 7.Qd2 dxc4 8.e4 c5 9.d5 exd5 10.e5 Bg5

Game 32 | Kasparov, Gary vs Karpov, Anatoly | Result 1-0 | ECO E12 | Endgame Queen+Pawns
  Endgame begins after ply 63 (32.Qxg5, White move).
  Material at transition: W P5 N0 B0 R0 Q1 | B P4 N0 B0 R0 Q1
  Final material: W P3 N0 B0 R0 Q1 | B P2 N0 B0 R0 Q1
  Opening sequence (first 10 moves): 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb7 5.a3 d5 6.cxd5 Nxd5 7.Qc2 Nd7 8.Nxd5 exd5 9.Bg5 f6 10.Bf4 c5

Game 40 | Kasparov, Gary vs Karpov, Anatoly | Result 1/2-1/2 | ECO D58 | Endgame Minor+Pawns
  Endgame begins after ply 94 (47...Kxd5, Black move).
  Material at transition: W P3 N1 B0 R0 Q0 | B P2 N1 B0 R0 Q0
  Final material: W P2 N1 B0 R0 Q0 | B P1 N1 B0 R0 Q0
  Opening sequence (first 10 moves): 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 h6 6.Bh4 O-O 7.e3 b6 8.Be2 Bb7 9.Bxf6 Bxf6 10.cxd5 exd5

Game 45 | Karpov, Anatoly vs Kasparov, Gary | Result 1/2-1/2 | ECO B85 | Endgame Rook(s)+Pawns
  Endgame begins after ply 58 (29...Rxe4, Black move).
  Material at transition: W P5 N0 B0 R1 Q0 | B P5 N0 B0 R1 Q0
  Final material: W P5 N0 B0 R1 Q0 | B P5 N0 B0 R1 Q0
  Opening sequence (first 10 moves): 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e6 7.O-O Be7 8.f4 O-O 9.Kh1 Qc7 10.a4 Nc6

Game 48 | Kasparov, Gary vs Karpov, Anatoly | Result 1-0 | ECO C42 | Endgame Rook(s)+Pawns
  Endgame begins after ply 69 (35.Rxe6, White move).
  Material at transition: W P5 N0 B0 R1 Q0 | B P4 N0 B0 R1 Q0
  Final material: W P3 N0 B0 R1 Q0 | B P1 N0 B0 R1 Q0
  Opening sequence (first 10 moves): 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 7.O-O Be7 8.c4 Nf6 9.Nc3 O-O 10.h3 dxc4