MESON Chess Problem Database

Problem Display
PID: 232296 (1r3q2/1p1PBkPP/8/3P3K/p7/3pRNR1/B7/r2Q4 w - - 0 1)

Bikov, Nikolai Aleksandrovich

Freie Presse, 1973

1r3q2/1p1PBkPP/8/3P3K/p7/3pRNR1/B7/r2Q4

#2

11 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd1
      • 2.d6#
  • Tries
    • 1.Kh6?
      • threat
        • 2.Sg5#
      • 1...Qxg7+
        • 2.Rxg7#
      • 1...Qxe7!
    • 1.Qxa1?
      • threat
        • 2.Sg5#
        • 2.Qf6#
        • 2.d6#
      • 1...Qxg7
        • 2.Rxg7#
        • 2.Qxg7#
        • 2.d6#
      • 1...Qc8
        • 2.Sg5#
        • 2.Qf6#
      • 1...Rc8
        • 2.Sg5#
        • 2.Qf6#
      • 1...Qxe7!
  • Keys
    • 1.Qf1!
      • threat
        • 2.Se1#
      • 1...Qxe7
        • 2.Se5#
      • 1...Qxg7
        • 2.Sg5#
      • 1...Rxf1
        • 2.d6#
      • 1...Rxa2
        • 2.Sd2#
      • 1...Re1
        • 2.Sxe1#
        • 2.d6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(a);N_GUARD,XQ(A)::B(B)+P(F)
  • Tries
    • Try
      • K(G);P-FLIGHT,P_SPINP(J)
      • Threat
        • S(D)
      • Vars
        • Q(g);CHECK,OGATE,XP(J)::R1(E),XQ(g)
      • Refutation
        • Q(g);N_PINP(J),XB(I)
    • Try
      • Q(A);XR(a)
      • Threat
        • DUALS(3)
      • Refutation
        • Q(g);XB(I)
  • Actual
    • Q(A);
    • Threat
      • QAR(A)+S(D)
    • Vars
      • Q(g);SBLOCK,XB(I)::QAR(A)+S(D),DCHECK
      • Q(g);SBLOCK,XP(J)::QAR(A)+S(D),DCHECK
      • R(a);N_GUARD,XQ(A)::B(B)+P(F)
      • R(a);N_GUARD,XB(B)::QAR(A)+S(D)
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