MESON Chess Problem Database

Problem Display
PID: 273286 (r1b4Q/1p1p3K/1pk3N1/1pb4R/1P6/7B/7B/8 w - - 0 1)

Backe, Espen

Backe, Odd Erik

Springaren, 1990

r1b4Q/1p1p3K/1pk3N1/1pb4R/1P6/7B/7B/8

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qxc8#
    • 1...Ra2
      • 2.Qxc8#
    • 1...Ra3
      • 2.Qxc8#
    • 1...Ra4
      • 2.Qxc8#
    • 1...Ra5
      • 2.Qxc8#
    • 1...Ra6
      • 2.Qxc8#
    • 1...Ra7
      • 2.Qxc8#
    • 1...Bg1
      • 2.Se7#
    • 1...Bf2
      • 2.Se7#
    • 1...Be3
      • 2.Se7#
    • 1...Bd4
      • 2.Se7#
    • 1...Be7
      • 2.Sxe7#
  • Tries
    • 1.Qd4?
      • threat
        • 2.Qd5#
      • 1...Bxd4
        • 2.Se7#
      • 1...Bd6
        • 2.Qxd6#
      • 1...d5
        • 2.Qxd5#
      • 1...d6!
    • 1.Qe5?
      • threat
        • 2.Qc7#
        • 2.Qd5#
      • 1...Bd6
        • 2.Qxd6#
      • 1...d5
        • 2.Qc7#
        • 2.Qxd5#
      • 1...d6!
    • 1.Qf6+?
      • 1...Bd6
        • 2.Qxd6#
      • 1...d6!
    • 1.Qe8?
      • threat
        • 2.Bg2#
      • 1...Ra2
        • 2.Qxc8#
      • 1...Ra3
        • 2.Qxc8#
      • 1...Bd6!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qc7#
      • 1...Bd6
        • 2.Bg2#
      • 1...d6
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 12
  • Sets
    • R(g);N_GUARD::QAR2(G),XB(h)
    • B(b);N_GUARD::S(E)
    • B(b);N_GUARD::S(E),XB(b)
  • Tries
    • Try
      • Q(G);
      • Threat
        • QAB1(G)
      • Vars
        • B(b);N_GUARD,XQ(G)::S(E)
        • B(b);N_GUARD::QAR1(G),XB(b)
        • P(f);::QAB1(G),XP(f)
      • Refutation
        • P(f);
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • B(b);N_GUARD::QAR1(G),XB(b)
      • Refutation
        • P(f);
    • Try
      • Q(G);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(G),XB(b)
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • Q(G);P_PINP(f)
      • Threat
        • B(B)
      • Vars
        • R(g);N_GUARD::QAR2(G),XB(h)
      • Refutation
        • B(b);
  • Actual
    • Q(G);
    • Threat
      • QAR1(G)
    • Vars
      • B(b);S_CUTP(f)::B(B)
      • P(f);S_CUTB(b)::S(E)
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