MESON Chess Problem Database

Problem Display
PID: 184732 (kq6/1b3R2/2B5/1NQ5/2p5/K3n3/2p5/2n3b1 w - - 0 1)

Prikryl, Bohuzlav

Lidove noviny, 1908

kq6/1b3R2/2B5/1NQ5/2p5/K3n3/2p5/2n3b1

#2

5 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qh2
      • 2.Qa7#
    • 1...Qg3
      • 2.Qa7#
    • 1...Qf4
      • 2.Qa7#
    • 1...Qe5
      • 2.Qa7#
    • 1...Qa7+
      • 2.Qxa7#
    • 1...Qc7
      • 2.Qa7#
    • 1...Qc8
      • 2.Qa7#
    • 1...Qd8
      • 2.Qa7#
    • 1...Qe8
      • 2.Qa7#
    • 1...Qf8
      • 2.Rxf8#
      • 2.Qxf8#
    • 1...Qg8
      • 2.Qa7#
    • 1...Qh8
      • 2.Qa7#
  • Tries
    • 1.Rxb7?
      • threat
        • 2.Ra7#
      • 1...Qa7+
        • 2.Qxa7#
      • 1...Qxb7
        • 2.Qa7#
        • 2.Qf8#
      • 1...Qh2
        • 2.Rb6#
        • 2.Qa7#
      • 1...Qg3
        • 2.Rb6#
        • 2.Qa7#
      • 1...Qf4
        • 2.Rb6#
        • 2.Qa7#
      • 1...Qe5
        • 2.Rb6#
        • 2.Qa7#
      • 1...Qc7
        • 2.Sxc7#
        • 2.Qa7#
      • 1...Qc8
        • 2.Qa7#
      • 1...Qd8
        • 2.Rb6#
        • 2.Qa7#
      • 1...Qe8
        • 2.Sc7#
        • 2.Qa7#
      • 1...Qf8
        • 2.Sc7#
        • 2.Rb6#
        • 2.Qxf8#
      • 1...Qg8
        • 2.Sc7#
        • 2.Rb6#
        • 2.Qa7#
      • 1...Qh8
        • 2.Sc7#
        • 2.Rb6#
        • 2.Qa7#
      • 1...Qd6!
    • 1.Rf8?
      • threat
        • 2.Sc7#
        • 2.Qa7#
      • 1...Qxf8
        • 2.Qxf8#
      • 1...Bxc6
        • 2.Qa7#
        • 2.Qxc6#
      • 1...Qc8
        • 2.Rxc8#
        • 2.Qa7#
      • 1...Qd8
        • 2.Rxd8#
        • 2.Qa7#
      • 1...Qe8
        • 2.Rxe8#
        • 2.Qa7#
      • 1...Bh2
        • 2.Qa7#
      • 1...Sd1
        • 2.Sc7#
      • 1...Sf1
        • 2.Sc7#
      • 1...Sg2
        • 2.Sc7#
      • 1...Sg4
        • 2.Sc7#
      • 1...Sf5
        • 2.Sc7#
      • 1...Sd5!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Bxb7#
      • 1...Qxf8+
        • 2.Rxf8#
      • 1...Bxc6
        • 2.Ra7#
      • 1...Qc8
        • 2.Qxc8#
      • 1...Qd8
        • 2.Qxd8#
      • 1...Qe8
        • 2.Qxe8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • Q(h);N_GUARD::QAR1(C)
    • Q(h);CHECK,N_GUARD::QAR1(C),XQ(h)
    • Q(h);N_GUARD,SBLOCK::QAR1(C)
  • Tries
    • Try
      • R(E);XB(f)
      • Threat
        • B(D)+R(E),DCHECK
      • Vars
        • Q(h);CHECK,N_GUARD::QAR1(C),XQ(h)
        • Q(h);N_GUARD::QAR1(C)
      • Refutation
        • Q(h);P_PINQ(C)
    • Try
      • R(E);P_PINQ(h)
      • Threat
        • DUALS(2)
      • Vars
        • Q(h);N_SPINQ(h),OGATE,P_PINQ(C),XR(E)::QAR(C),XQ(h)
        • B(b);::QAR1(C)
        • S(d);::S(B)
      • Refutation
        • S(d);
  • Actual
    • Q(C);P_PINQ(h)
    • Threat
      • B(D),XB(f)
    • Vars
      • Q(h);CHECK,N_SPINQ(h),OGATE,XQ(C)::R(E),XQ(h)
      • B(f);N_SPINB(f),OGATE,XB(D)::R1(E)
      • Q(h);OGATEB::QAR2(C),XQ(h)
      • Q(h);OGATEB::QAR(C),XQ(h)
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