MESON Chess Problem Database

Problem Display
PID: 144207 (2n5/6K1/2pB1P2/2Nk1p2/1p2N3/1q1rQB2/4P3/3R4 w - - 0 1)

Nietvelt, Gustaaf Josephus

Magyar Sakkvilag, 1930

2n5/6K1/2pB1P2/2Nk1p2/1p2N3/1q1rQB2/4P3/3R4

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Qxd3#
    • 1...Qa4
      • 2.Qxd3#
    • 1...Rd4
      • 2.Rxd4#
      • 2.Qxd4#
      • 2.Qxb3#
  • Tries
    • 1.Sc3+?
      • 1...Kc4
        • 2.Qxd3#
      • 1...Kxd6!
    • 1.Rxd3+?
      • 1...Qxd3
        • 2.Qxd3#
      • 1...Kc4!
  • Keys
    • 1.Sb7!
      • threat
        • 2.Sd2#
      • 1...Kc4
        • 2.Qc5#
      • 1...Ke6
        • 2.Sec5#
      • 1...Sxd6
        • 2.Sexd6#
      • 1...fxe4
        • 2.Qxe4#
      • 1...Qc4
        • 2.Sc3#
      • 1...Rd2
        • 2.Sxd2#
      • 1...Rd4
        • 2.Qxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 2
  • Sets
    • Q(a);N_GUARD::QAR2(C),XR(b)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(d);N_SPINR(b),S_FLIGHT::QAB1(C),XR(b)
      • Refutation
        • K(d);P-FLIGHT,XB(G)
    • Try
      • R(A);CHECK,XR(b)
      • Vars
        • Q(a);OGATE,XR(A)::QAR2(C),XQ(a)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • S(F);
    • Threat
      • B(D)+S(E)
    • Vars
      • K(d);N_SPINR(b),S_FLIGHT::QAR1(C)
      • K(d);N_SPINR(b),S_FLIGHT::QAR(C)+S(E),DCHECK
      • S(g);XB(G)::B(D)+S(E),XS(g)
      • P(e);OGATE,P_SPINP(e),XS(E)::QAB1(C),XP(e)
      • Q(a);SBLOCK::B(D)+S(E),DCHECK
      • R(b);::B(D)+S(E),XR(b)
      • R(b);OGATE::QAB(C),XQ(a)
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Developed and maintained by Brian Stephenson.
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