MESON Chess Problem Database

Problem Display
PID: 243918 (4R3/3b4/2ppN3/2Q4n/1N2kP2/2P4K/4PR2/1q3nb1 w - - 0 1)

Fleck, Ferenc

Arbejder-Skak, 1955

4R3/3b4/2ppN3/2Q4n/1N2kP2/2P4K/4PR2/1q3nb1

#2

9 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3+
      • 2.exd3#
    • 1...Bxe6+
      • 2.Rxe6#
    • 1...Bxe8
      • 2.Sg5#
    • 1...Sxf4+
      • 2.Rxf4#
  • Tries
    • 1.Qc4+?
      • 1...Ke3
        • 2.Qd4#
      • 1...Kf5!
    • 1.Qd5+?
      • 1...Ke3
        • 2.Qd4#
      • 1...cxd5!
    • 1.f5?
      • threat
        • 2.Sg5#
        • 2.Qd4#
      • 1...Qd3+
        • 2.exd3#
      • 1...Sf4+
        • 2.Rxf4#
      • 1...Qxb4
        • 2.Sg5#
      • 1...Bxe6
        • 2.Rxe6#
        • 2.Qd4#
      • 1...dxc5
        • 2.Sxc5#
        • 2.Sg5#
      • 1...Qd1
        • 2.Sg5#
      • 1...Bxf2!
  • Keys
    • 1.Qxd6!
      • threat
        • 2.Qe5#
      • 1...Qd3+
        • 2.Qxd3#
      • 1...Bxe6+
        • 2.Qxe6#
      • 1...Sxf4+
        • 2.Qxf4#
      • 1...Ke3
        • 2.Qd4#
      • 1...Kf5
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(a);CHECK,OGATE::P(A),XQ(a)
    • B(h);CHECK,OGATE,P_SPINB(h),XS(H)::R(I),XB(h)
    • B(h);N_PINS(H),XR(I)::S(H)
    • S(e);CHECK,OGATE,XP(F)::R1(B),XS(e)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);P-FLIGHT::QAB1(G)
      • Refutation
        • K(d);N_PINS(H),S_FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);P-FLIGHT::QAB1(G)
      • Refutation
        • P(f);XQ(G)
    • Try
      • P(F);N_SPINS(H)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);CHECK,OGATE::P(A),XQ(a)
        • S(e);CHECK,N_GUARD::R1(B),XS(e)
        • Q(a);XS(E)::R(I)+S(H),DCHECK
        • Q(a);::R(I)+S(H),DCHECK
      • Refutation
        • B(c);XR(B)
  • Actual
    • Q(G);XP(g)
    • Threat
      • QAR1(G)
    • Vars
      • Q(a);CHECK,N_GUARD::QAB1(G),XQ(a)
      • B(h);CHECK,OGATE,P_SPINB(h),XS(H)::QAR2(G),XB(h)
      • S(e);CHECK,OGATE,XP(F)::QAR1(G),XS(e)
      • K(d);P-FLIGHT::QAB1(G)
      • K(d);N_PINS(H),S_FLIGHT::S(H)
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