MESON Chess Problem Database

Problem Display
PID: 145772 (2qn4/4P1KB/4pN1B/6P1/r3bk2/5N2/1b1P1Q2/8 w - - 0 1)

Pape, Edouard

Good Companions (November), 1917

2qn4/4P1KB/4pN1B/6P1/r3bk2/5N2/1b1P1Q2/8

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf3
      • 2.Qh2#
    • 1...Bf5
      • 2.g6#
  • Tries
    • 1.Se1+?
      • 1...Bf3
        • 2.Sd3#
        • 2.Qh2#
      • 1...Ke5!
    • 1.Sg1+?
      • 1...Bf3
        • 2.Qh2#
      • 1...Ke5!
    • 1.Sd4+?
      • 1...Bf3
        • 2.Qh2#
      • 1...Ke5!
    • 1.Sh4+?
      • 1...Bf3
        • 2.Qh2#
      • 1...Ke5!
    • 1.Se5+?
      • 1...Bf3
        • 2.Sd3#
        • 2.Qh2#
      • 1...Kxe5!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Qg4#
      • 1...Bxf6+
        • 2.gxf6#
      • 1...Bxf3
        • 2.Qh2#
      • 1...Bf5
        • 2.g6#
      • 1...e5
        • 2.Sh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(c);P_SPINB(c),SBLOCK,XS(C)::QAB(B)
    • B(c);SBLOCK::B(F)+P(D)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(d);N_PINS(E),S_FLIGHT
    • Try
      • S(C);CHECK
      • Vars
        • B(c);P_SPINB(c)::QAB(B)
      • Refutation
        • K(d);N_PINS(E),S_FLIGHT
    • Try
      • S(C);CHECK,N_SPINS(E)
      • Vars
        • B(c);P_SPINB(c)::QAB(B)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • S(C);CHECK
      • Vars
        • B(c);P_SPINB(c)::QAB(B)
      • Refutation
        • K(d);N_PINS(E),S_FLIGHT
    • Try
      • S(C);CHECK,N_SPINS(E)
      • Refutation
        • K(d);S_FLIGHT,XS(C)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • B(a);CHECK,OGATE,XS(E)::B(F)+P(D),XB(a)
      • B(c);SBLOCK,XS(C)::QAB(B)
      • B(c);SBLOCK::B(F)+P(D)
      • P(e);N_PINS(E)::S(E)
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