MESON Chess Problem Database

Problem Display
PID: 264402 (1B1N3K/7B/4Np2/2pkP2R/3q2nR/2Pp4/3P2r1/6Q1 w - - 0 1)

Cristoffanini, Guido

Shakhmaty v SSSR, 1931

1B1N3K/7B/4Np2/2pkP2R/3q2nR/2Pp4/3P2r1/6Q1

#2

11 + 7

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5
      • 2.Qxc5#
    • 1...Qa4
      • 2.Qxc5#
    • 1...Qc4
      • 2.Sc7#
    • 1...Qe4
      • 2.Qxc5#
    • 1...Qf4
      • 2.Qxc5#
    • 1...c4
      • 2.Qxd4#
  • Tries
    • 1.Be4+?
      • 1...Kxe4
        • 2.Qxg2#
      • 1...Qxe4
        • 2.Qxc5#
      • 1...Kc4!
    • 1.Qxg2+?
      • 1...Qe4
        • 2.Qxe4#
      • 1...Kc4!
    • 1.c4+?
      • 1...Qxc4
        • 2.Sc7#
      • 1...Kxc4!
  • Keys
    • 1.Bg8!
      • threat
        • 2.Sg5#
      • 1...Kc4
        • 2.Sxd4#
      • 1...Ke4
        • 2.Qxg2#
      • 1...Qxe5
        • 2.Sxc5#
      • 1...Sxe5
        • 2.Sg7#
      • 1...Sh6
        • 2.Sc7#
      • 1...c4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • Q(c);OGATE,P_SPINQ(c),XP(E)::QAR1(A),XP(e)
    • Q(c);OGATE::QAR1(A),XP(e)
    • Q(c);SBLOCK::S(G)
    • P(e);N_GUARD::QAR1(A),XQ(c)
  • Tries
    • Try
      • B(H);CHECK
      • Vars
        • K(f);N_GUARD,P_SPINS(d),S_CUTQ(c),S_FLIGHT,XB(H)::QAB(A),XR(a)
        • Q(c);OGATE,SBLOCK,XB(H)::QAR1(A),XP(e)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • Q(A);CHECK,XR(a)
      • Vars
        • Q(c);N_GUARD,P_SPINQ(c)::QAB1(A),XQ(c)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • P(C);CHECK
      • Vars
        • Q(c);SBLOCK,XP(C)::S(G)
      • Refutation
        • K(f);S_FLIGHT,XP(C)
  • Actual
    • B(H);
    • Threat
      • B(H)+S(G)
    • Vars
      • K(f);N_GUARD,S_FLIGHT::B(H)+S(G),XQ(c)
      • K(f);N_GUARD,P_SPINS(d),S_CUTQ(c),S_FLIGHT::QAB(A),XR(a)
      • Q(c);P_SPINQ(c),XP(E)::B(H)+S(G),XP(e)
      • S(d);P_SPINS(d),XP(E)::B(H)+S(G)
      • S(d);::B(H)+S(G),DCHECK
      • P(e);N_GUARD::QAR1(A),XQ(c)
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Developed and maintained by Brian Stephenson.
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