MESON Chess Problem Database

Problem Display
PID: 232284 (B7/8/8/Q7/7P/4K3/6R1/6rk w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1971

B7/8/8/Q7/7P/4K3/6R1/6rk

#2

5 + 2

15148 Sadier Collection 2021
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qxa1#
    • 1...Re1+
      • 2.Qxe1#
  • Tries
    • 1.Qe1?
      • threat
        • 2.Ra2#
        • 2.Rb2#
        • 2.Rc2#
        • 2.Rd2#
        • 2.Re2#
        • 2.Rf2#
        • 2.Qxg1#
      • 1...Rf1
        • 2.Qxf1#
      • 1...Rxe1+!
    • 1.Qa1?
      • threat
        • 2.Ra2#
        • 2.Rb2#
        • 2.Rc2#
        • 2.Rd2#
        • 2.Re2#
        • 2.Rf2#
        • 2.Qxg1#
      • 1...Re1+
        • 2.Qxe1#
      • 1...Rb1
        • 2.Qxb1#
      • 1...Rc1
        • 2.Qxc1#
      • 1...Rd1
        • 2.Qxd1#
      • 1...Rf1
        • 2.Qxf1#
      • 1...Rxa1!
  • Keys
    • 1.Qg5!
      • 1...Re1+
        • 2.Re2#
      • 1...Rxg2
        • 2.Qxg2#
      • 1...Ra1
        • 2.Ra2#
      • 1...Rb1
        • 2.Rb2#
      • 1...Rc1
        • 2.Rc2#
      • 1...Rd1
        • 2.Rd2#
      • 1...Rf1
        • 2.Rf2#

This anticipates 233403(1978)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(a);OGATEB::QAB1(D),XR(a)
    • R(a);CHECK,OGATEB::QAR(D),XR(a)
  • Tries
    • Try
      • Q(D);P_PINR(a)
      • Threat
        • DUALS(7)
      • Vars
        • R(a);OGATEB::QAR2(D),XR(a)
      • Refutation
        • R(a);CHECK,N_SPINR(a),XQ(D)
    • Try
      • Q(D);P_PINR(a)
      • Threat
        • DUALS(7)
      • Vars
        • R(a);CHECK,OGATEB::QAR(D),XR(a)
        • R(a);OGATEB::QAR(D),XR(a)
        • R(a);OGATEB::QAR2(D),XR(a)
      • Refutation
        • R(a);N_SPINR(a),XQ(D)
  • Actual
    • Q(D);
    • Vars
      • R(a);CHECK,N_GUARD::B(E)+R(A)
      • R(a);OGATE,P_SPINR(a),XR(A)::QAB1(D),XR(a)
      • R(a);N_GUARD::B(E)+R(A)
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