MESON Chess Problem Database

Problem Display
PID: 271685 (5N1K/3P2R1/3N1k2/b2pr2p/1pb1p3/6p1/3P1P2/B4R2 w - - 0 1)

Gurr, John

Sunday Referee, 1933

(First published on Sun Sep 10 1933)

5N1K/3P2R1/3N1k2/b2pr2p/1pb1p3/6p1/3P1P2/B4R2

#2

9 + 9

15239 Valois Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Ba2
      • 2.fxg3#
    • 1...Bb3
      • 2.fxg3#
    • 1...gxf2
      • 2.Rxf2#
  • Tries
    • 1.f4?
      • threat
        • 2.Bxe5#
        • 2.Rf7#
        • 2.fxe5#
      • 1...exf4 ep
        • 2.Rxf3#
      • 1...d4!
    • 1.d8S?
      • threat
        • 2.Sd7#
        • 2.Sh7#
      • 1...Bb5
        • 2.Sh7#
      • 1...Bxd8!
  • Keys
    • 1.d4!
      • threat
        • 2.dxe5#
      • 1...exd4 ep
        • 2.fxg3#
      • 1...Rf5
        • 2.Se8#
      • 1...Rg5
        • 2.Rf7#
      • 1...Re6
        • 2.Sh7#
      • 1...Re7
        • 2.Rg6#
      • 1...Re8
        • 2.dxe8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • B(c);N_GUARD::R(B)+P(D),XP(a)
    • P(a);OGATE,P_SPINP(a),XP(D)::R(B),XP(a)
  • Tries
    • Try
      • P(D);
      • Threat
        • DUALS(3)
      • Vars
        • P(d);EP,OGATEB,P_SPINP(d),XP(D)::R(B),XP(d)
      • Refutation
        • P(f);N_SPINR(g)
    • Try
      • P(F);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);::S(H)
      • Refutation
        • B(e);XS(F)
  • Actual
    • P(C);N_PINR(g)
    • Threat
      • P(C),XR(g)
    • Vars
      • P(d);EP,P_SPINR(g),S_CUTB(c),XP(C)::R(B)+P(D),XP(a)
      • R(g);N_GUARD,SBLOCK::S(E)
      • R(g);SBLOCK::R1(G)
      • R(g);SBLOCK::S(H)
      • R(g);OGATE,P_PINS(H)::PXR(g)=S
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