MESON Chess Problem Database

Problem Display
PID: 87447 (8/N2N3K/r4pR1/b3p3/1pkp4/8/2BB3p/1qR4Q w - - 0 1)

Bielczykow, N

Bikov, Nikolai Aleksandrovich

Problemista, 1972

8/N2N3K/r4pR1/b3p3/1pkp4/8/2BB3p/1qR4Q

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rc6
      • 2.Qxc6#
    • 1...Rxa7
      • 2.Qc6#
    • 1...d3
      • 2.Qe4#
  • Tries
    • 1.Qf1+?
      • 1...d3
        • 2.Qxd3#
      • 1...Kd5!
  • Keys
    • 1.Rg3!
      • threat
        • 2.Bxb1#
      • 1...Qxc2+
        • 2.Rxc2#
      • 1...Qxc1
        • 2.Bb3#
      • 1...Rxa7
        • 2.Qc6#
      • 1...d3
        • 2.Qe4#
      • 1...e4
        • 2.Bb3#
      • 1...Qa2
        • 2.Bb3#
      • 1...Qa1
        • 2.Bb3#
      • 1...Qb2
        • 2.Bb3#
      • 1...Qb3
        • 2.Bxb3#
        • 2.Bd3#
      • 1...b3
        • 2.Bd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • R(h);N_GUARD::QAR2(B),XR(h)
    • R(h);N_GUARD,P_PINS(G),XS(F)::QAR2(B)
    • P(e);OGATEB::QAR2(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • P(e);P_SPINP(e)::QAB1(B),XP(e)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • R(E);P_SPINB(C)
    • Threat
      • R(A)+B(C),XQ(a)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XB(C)::R(A),XQ(a)
      • Q(a);N_PINB(C),XR(A)::B(C)
      • R(h);N_GUARD,P_PINS(G),XS(F)::QAR2(B)
      • P(e);N_PINB(C)::QAR2(B)
      • P(g);N_PINB(C)::R(A)+B(C),DCHECK
      • Q(a);N_PINB(C)::R(A)+B(C),DCHECK
      • P(c);SBLOCK::R(A)+B(C),DCHECK
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