MESON Chess Problem Database

Problem Display
PID: 60172 (7B/3bqB2/2pP1R2/8/3kNQ1K/8/5N2/b7 w - - 0 1)

Nietvelt, Gustaaf Josephus

Comm., Brisbane Courier, 1930

7B/3bqB2/2pP1R2/8/3kNQ1K/8/5N2/b7

#2

8 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd6
      • 2.Rxd6#
    • 1...Qxf6+
      • 2.Bxf6#
    • 1...Qxe4
      • 2.Rf5#
    • 1...Qe5
      • 2.Qd2#
  • Tries
    • 1.Qe3+?
      • 1...Ke5
        • 2.Sd3#
        • 2.Sd2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Qc5#
      • 1...Kxe3!
    • 1.dxe7?
      • threat
        • 2.Rf5#
        • 2.Rxc6#
        • 2.Rd6#
        • 2.Rg6#
        • 2.Rh6#
      • 1...Bf5
        • 2.Rxf5#
        • 2.Rxc6#
        • 2.Rd6#
        • 2.Rg6#
        • 2.Rh6#
      • 1...c5
        • 2.Rf5#
        • 2.Ra6#
        • 2.Rb6#
        • 2.Rc6#
        • 2.Rd6#
        • 2.Rg6#
        • 2.Rh6#
      • 1...Be6!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Qc5#
      • 1...Qxf6+
        • 2.Bxf6#
      • 1...Qxe4+
        • 2.Rf4#
      • 1...Ke5
        • 2.Qxa1#
        • 2.Qc5#
      • 1...Qxd6
        • 2.Rxd6#
      • 1...Qe5
        • 2.Qd2#
      • 1...Bc3
        • 2.Qxc3#
      • 1...c5
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(e);N_PINR(F),XP(E)::B(H)+R(F),DCHECK,XQ(e)
    • Q(e);CHECK,OGATE,P_SPINQ(e),XR(F)::B(H),XQ(e)
    • Q(e);N_PINR(F),P_PINQ(C),P_SPINQ(e),XS(B)::B(H)+R(F)
    • Q(e);N_PINR(F),SBLOCK::QAR2(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Refutation
        • K(b);S_FLIGHT,XQ(C)
    • Try
      • P(E);N_SPINR(F),XQ(e)
      • Threat
        • DUALS(5)
      • Refutation
        • B(d);
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • Q(e);CHECK,OGATE,P_SPINQ(e),XR(F)::B(H),XQ(e)
      • Q(e);CHECK,N_PINR(F),XS(B)::B(H)+R(F)
      • Q(e);N_PINR(F),XP(E)::B(H)+R(F),DCHECK,XQ(e)
      • Q(e);N_PINR(F),SBLOCK::QAR2(C)
      • B(a);N_GUARD::QAB1(C),XB(a)
      • P(c);::QAB1(C),XP(c)
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