MESON Chess Problem Database

Problem Display
PID: 53889 (3K4/1PNRNP2/1r1B1r1p/b1P5/3k1p1q/1P2R3/8/6Q1 w - - 0 1)

Jonsson, Gustav

Chess Life, 1955

3K4/1PNRNP2/1r1B1r1p/b1P5/3k1p1q/1P2R3/8/6Q1

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rb4
      • 2.Sc6#
    • 1...Rb5
      • 2.Sc6#
    • 1...Rc6
      • 2.Sxc6#
    • 1...Rxb7
      • 2.Sc6#
    • 1...Rf5
      • 2.Se6#
    • 1...Rxd6
      • 2.Se6#
    • 1...Re6
      • 2.Sxe6#
    • 1...Rxf7
      • 2.Se6#
  • Tries
    • 1.Rd3+?
      • 1...Ke4
        • 2.Qd4#
      • 1...Kxd3!
    • 1.Qa1+?
      • 1...Bc3
        • 2.Qxc3#
      • 1...Kxe3!
    • 1.Qd1+?
      • 1...Bd2
        • 2.Qxd2#
      • 1...Kxe3!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Be5#
      • 1...Rbxd6
        • 2.Sc6#
      • 1...Rfxd6
        • 2.Se6#
      • 1...fxe3
        • 2.Qc4#
      • 1...Bd2
        • 2.Qxd2#
      • 1...Bc3
        • 2.Qxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • R(e);N_GUARD,P_PINS(G)::S(I)
    • R(e);N_GUARD,P_PINS(G)::S(I),XR(e)
    • R(e);N_GUARD,P_PINS(G),XP(F)::S(I)
    • R(f);N_GUARD,P_PINS(I)::S(G)
    • R(f);N_GUARD,P_PINR(H),P_PINS(I),P_SPINR(f),XB(E)::S(G)
    • R(f);N_GUARD,P_PINS(I)::S(G),XR(f)
    • R(f);N_GUARD,P_PINS(I),XP(J)::S(G)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(A)
      • Refutation
        • K(a);P-FLIGHT,XR(C)
    • Try
      • Q(A);CHECK
      • Vars
        • B(d);N_GUARD,P_SPINB(d)::QAB1(A),XB(d)
      • Refutation
        • K(a);S_FLIGHT,XR(C)
    • Try
      • Q(A);CHECK
      • Vars
        • B(d);N_GUARD,P_SPINB(d)::QAR2(A),XB(d)
      • Refutation
        • K(a);S_FLIGHT,XR(C)
  • Actual
    • Q(A);
    • Threat
      • R(H)+B(E),DCHECK
    • Vars
      • R(e);N_GUARD,P_PINR(H),P_PINS(G),P_SPINR(e),XB(E)::S(I)
      • R(f);N_GUARD,P_PINR(H),P_PINS(I),P_SPINR(f),XB(E)::S(G)
      • P(b);SBLOCK,XR(C)::QAR1(A)
      • B(d);N_GUARD::QAR2(A),XB(d)
      • B(d);N_GUARD::QAB1(A),XB(d)
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