MESON Chess Problem Database

Problem Display
PID: 235179 (2r5/8/3pp3/1P1krp2/P3bR2/3N1N2/4Q3/B2RK2B w - - 0 1)

Groeneveld, Cornelis

Schach, 1966

2r5/8/3pp3/1P1krp2/P3bR2/3N1N2/4Q3/B2RK2B

#2

10 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qa2#
    • 1...Rc5
      • 2.Sb4#
    • 1...Ra8
      • 2.Qa2#
    • 1...Rb8
      • 2.Qa2#
    • 1...Rd8
      • 2.Qa2#
    • 1...Re8
      • 2.Qa2#
    • 1...Rf8
      • 2.Qa2#
    • 1...Rg8
      • 2.Qa2#
    • 1...Rh8
      • 2.Qa2#
    • 1...Bxf3
      • 2.Rd4#
  • Tries
    • 1.Qe3?
      • threat
        • 2.Qd4#
      • 1...Bxd3
        • 2.Sxe5#
        • 2.Rxd3#
      • 1...Bxf3
        • 2.Sc1#
        • 2.Sb2#
        • 2.Sf2#
        • 2.Sb4#
        • 2.Sc5#
        • 2.Sxe5#
        • 2.Rd4#
      • 1...Rc4
        • 2.Sb4#
      • 1...Kc4!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qd4#
      • 1...Bxd3+
        • 2.Sxe5#
      • 1...Bxf3+
        • 2.Sxe5#
      • 1...Kc4
        • 2.Qa2#
      • 1...Rc4
        • 2.Sb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • K(b);P_SPINB(a),S_FLIGHT::QAB(E)
    • R(g);SBLOCK::R(B)+S(F),DCHECK
    • R(g);N_GUARD::QAB(E)
    • B(a);OGATE,P_PINQ(E),P_SPINB(a),XS(G)::R1(I)
  • Tries
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • R(g);SBLOCK::R(B)+S(F),DCHECK
      • Refutation
        • K(b);P_SPINB(a),S_FLIGHT
  • Actual
    • Q(E);
    • Threat
      • QAR1(E)
    • Vars
      • B(a);CHECK,P_SPINB(a),XS(F)::B(D)+S(G),XR(c)
      • B(a);CHECK,N_GUARD,P_SPINB(a),XS(G)::R(B)+S(F),XR(c)
      • K(b);P_SPINB(a),S_FLIGHT::QAB(E)
      • R(g);SBLOCK::R(B)+S(F),DCHECK
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