MESON Chess Problem Database

Problem Display
PID: 205872 (2N5/2P5/kr1p4/3Q4/8/3N4/K7/R1B5 w - - 0 1)

Degener, Udo

Troll, 2019

2N5/2P5/kr1p4/3Q4/8/3N4/K7/R1B5

#2

7 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Kxb1#
    • 1...Rb2+
      • 2.Kxb2#
    • 1...Rb3
      • 2.Kxb3#
    • 1...Rb4
      • 2.Sxb4#
    • 1...Rb5
      • 2.Qa8#
    • 1...Rb8
      • 2.cxb8S#
  • Tries
    • 1.Bb2?
      • threat
        • 2.Kb1#
      • 1...Rxb2+
        • 2.Kxb2#
      • 1...Rb5
        • 2.Qa8#
      • 1...Rb4
        • 2.Sxb4#
      • 1...Rb3
        • 2.Kxb3#
      • 1...Rc6!
  • Keys
    • 1.Bd2!
      • 1...Rb2+
        • 2.Kxb2#
      • 1...Rc6
        • 2.Qxc6#
      • 1...Rb4
        • 2.Sxb4#
      • 1...Rb1
        • 2.Kxb1#
      • 1...Rb3
        • 2.Kxb3#
      • 1...Rb5
        • 2.Qa8#
      • 1...Rb7
        • 2.Qa5#
      • 1...Rb8
        • 2.cxb8S#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(b);::R(A)+K(C),XR(b)
    • R(b);CHECK::R(A)+K(C),XR(b)
    • R(b);N_GUARD::S(D),XR(b)
    • R(b);SBLOCK::QAR2(E)
    • R(b);OGATE::PXR(b)=S
  • Tries
    • Try
      • B(B);
      • Threat
        • R(A)+K(C)
      • Vars
        • R(b);CHECK,XB(B)::R(A)+K(C),XR(b)
        • R(b);SBLOCK::QAR2(E)
        • R(b);N_GUARD::S(D),XR(b)
        • R(b);::R(A)+K(C),XR(b)
      • Refutation
        • R(b);
  • Actual
    • B(B);
    • Vars
      • R(b);CHECK::R(A)+K(C),XR(b)
      • R(b);OGATEB::QAR2(E),XR(b)
      • R(b);N_GUARD::S(D),XR(b)
      • R(b);::R(A)+K(C),XR(b)
      • R(b);SBLOCK::QAR2(E)
      • R(b);SBLOCK::QAR1(E)
      • R(b);OGATE::PXR(b)=S
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