MESON Chess Problem Database

Problem Display
PID: 87931 (8/8/8/8/p7/b1QK4/r7/2Bk4 w - - 0 1)

Kashcheev, Niktopolion Pavlovich

Problemista, 1964

8/8/8/8/p7/b1QK4/r7/2Bk4

#2

3 + 4

6490 yacpdb 2009
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qd2#
    • 1...Rd2+
      • 2.Qxd2#
    • 1...Bb2
      • 2.Qd2#
  • Tries
    • 1.Bb2?
      • threat
        • 2.Qd2#
        • 2.Qc1#
      • 1...Bxb2
        • 2.Qd2#
      • 1...Ra1
        • 2.Qd2#
      • 1...Bb4
        • 2.Qc1#
      • 1...Rxb2!
  • Keys
    • 1.Bd2!
      • 1...Rxd2+
        • 2.Qxd2#
      • 1...Ra1
        • 2.Qc2#
      • 1...Rb2
        • 2.Qc1#
      • 1...Rc2
        • 2.Qxc2#
      • 1...Bc1
        • 2.Qxc1#
      • 1...Bb2
        • 2.Qc2#
      • 1...Bb4
        • 2.Qc1#
      • 1...Bc5
        • 2.Qc1#
      • 1...Bd6
        • 2.Qc1#
      • 1...Be7
        • 2.Qc1#
      • 1...Bf8
        • 2.Qc1#

This anticipates 172330(1996)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • R(b);N_GUARD::QAR1(B)
    • R(b);CHECK,N_GUARD::QAR1(B),XR(b)
    • B(c);S_CUTR(b)::QAR1(B)
  • Tries
    • Try
      • B(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);XB(A)::QAR1(B)
        • R(b);::QAR1(B)
        • B(c);::QAR1(B)
      • Refutation
        • R(b);XB(A)
  • Actual
    • B(A);
    • Vars
      • R(b);CHECK,OGATE,XB(A)::QAR1(B),XR(b)
      • R(b);N_GUARD::QAB1(B)
      • R(b);S_CUTB(c)::QAR1(B)
      • R(b);N_GUARD::QAB1(B),XR(b)
      • B(c);N_GUARD::QAR1(B),XB(c)
      • B(c);S_CUTR(b)::QAB1(B)
      • B(c);N_GUARD::QAR1(B)
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