MESON Chess Problem Database

Problem Display
PID: 96416 (n7/8/p1K5/krP1Q3/NRR5/3p4/8/8 w - - 0 1)

Goldschmeding, Cornelis

Problem (Zagreb), 1957

n7/8/p1K5/krP1Q3/NRR5/3p4/8/8

#2

6 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc5+
      • 2.Qxc5#
    • 1...Rb6+
      • 2.cxb6#
  • Tries
    • 1.Qa1?
      • threat
        • 2.Sb2#
        • 2.Sc3#
        • 2.Sb6#
      • 1...Rxc5+
        • 2.Sxc5#
      • 1...Rb6+
        • 2.Sxb6#
      • 1...Sb6
        • 2.Sxb6#
      • 1...Rxb4!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Rxb5#
      • 1...Rxc5+
        • 2.Rxc5#
      • 1...Rb6+
        • 2.Rxb6#
      • 1...Rxb4
        • 2.Qxb4#
      • 1...Rb7
        • 2.Rb5#
        • 2.Rb6#
        • 2.Rxb7#
      • 1...Rb8
        • 2.Rb5#
        • 2.Rb6#
        • 2.Rb7#
        • 2.Rxb8#

There are these versions: 18674

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(c);CHECK,OGATE,P_SPINR(c),XP(D)::QAR2(E),XR(c)
    • R(c);CHECK,OGATE::QAR(E)+P(D),XR(c)
  • Tries
    • Try
      • Q(E);
      • Threat
        • DUALS(3)
      • Vars
        • R(c);CHECK,XP(D)::QAR(E)+S(A),XR(c)
        • R(c);CHECK::QAR(E)+S(A),XR(c)
        • S(e);::QAR(E)+S(A),XS(e)
      • Refutation
        • R(c);XR(B)
  • Actual
    • Q(E);
    • Threat
      • QAB(E)+R(B),DCHECK,XR(c)
    • Vars
      • R(c);CHECK,OGATE,XP(D)::R(C),XR(c)
      • R(c);CHECK,OGATE::QAB(E)+R(B),XR(c)
      • R(c);OGATE,P_SPINR(c),XR(B)::QAB1(E),XR(c)
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