MESON Chess Problem Database

Problem Display
PID: 176217 (rN2krR1/1R2p3/8/3Q2p1/p6b/K4b2/4p3/8 w - - 0 1)

Haring, Jacobus

Comm., Schach-Echo, 1977

rN2krR1/1R2p3/8/3Q2p1/p6b/K4b2/4p3/8

#2

5 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb8
      • 2.Rxb8#
    • 1...Rxg8
      • 2.Qxg8#
    • 1...e5
      • 2.Qd7#
    • 1...e6
      • 2.Qd7#
  • Tries
    • 1.Qxf3?
      • threat
        • 2.Rxf8#
        • 2.Qxf8#
      • 1...Kd8
        • 2.Rxf8#
        • 2.Qxf8#
      • 1...Rxg8!
    • 1.Qc6+?
      • 1...Kf7
        • 2.Qg6#
      • 1...Kd8
        • 2.Rxf8#
        • 2.Qd7#
      • 1...Bxc6!
    • 1.Qf7+?
      • 1...Kd8
        • 2.Rxf8#
        • 2.Qxf8#
      • 1...Kxf7!
    • 1.Qf5?
      • threat
        • 2.Rxf8#
        • 2.Qxf8#
      • 1...Kd8
        • 2.Rxf8#
        • 2.Qd7#
        • 2.Qxf8#
      • 1...Rxg8!
    • 1.Qd8+?
      • 1...Kxd8
        • 2.Rxf8#
      • 1...Kf7!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Rxf8#
      • 1...Kd8
        • 2.Rxf8#
      • 1...Rxg8
        • 2.Qxg8#
      • 1...e5
        • 2.Sf6#
      • 1...e6
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(g);OGATE,XS(D)::R(C),XR(g)
    • R(i);N_SPINR(i),OGATE,XR(E)::QAR2(B),XR(i)
    • P(f);::QAB1(B)
  • Tries
    • Try
      • Q(B);XB(b)
      • Threat
        • DUALS(2)
      • Refutation
        • R(i);N_SPINR(i),XR(E)
    • Try
      • Q(B);CHECK
      • Vars
        • K(h);N_SPINR(i),P_SPINP(f),S_FLIGHT::QAB1(B)
      • Refutation
        • B(b);XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(h);N_SPINR(i),P_SPINP(f),S_FLIGHT,XQ(B)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Refutation
        • R(i);N_SPINR(i),XR(E)
    • Try
      • Q(B);CHECK
      • Vars
        • K(h);P-FLIGHT,XQ(B)::R(E),XR(i)
      • Refutation
        • K(h);N_SPINR(i),P_SPINP(f),S_FLIGHT
  • Actual
    • S(D);
    • Threat
      • R1(E),XR(i)
    • Vars
      • K(h);P-FLIGHT::R(E),XR(i)
      • R(i);N_SPINR(i),OGATE,XR(E)::QAR2(B),XR(i)
      • P(f);N_GUARD::S(D)
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