MESON Chess Problem Database

Problem Display
PID: 9384 (8/1n3pB1/1K1PBR2/1p1N1Q2/1N1k4/1p6/4q3/1n2r3 w - - 0 1)

Shinkman, William Anthony

Checkmate, 1902

8/1n3pB1/1K1PBR2/1p1N1Q2/1N1k4/1p6/4q3/1n2r3

#2

8 + 8

3925 The Golden Argosy 1929

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Qd3#
  • Tries
    • 1.Rxf7+?
      • 1...Qe5
        • 2.Qd3#
      • 1...Kc4!
    • 1.Qc2?
      • threat
        • 2.Sc6#
        • 2.Rf4#
      • 1...Qxc2
        • 2.Rf4#
      • 1...Qxe6
        • 2.Rf4#
      • 1...bxc2
        • 2.Rf4#
      • 1...fxe6
        • 2.Rf4#
      • 1...Qd3
        • 2.Rf4#
      • 1...Sc3
        • 2.Rf4#
      • 1...Qc4
        • 2.Rf4#
      • 1...Qe4
        • 2.Sc6#
      • 1...Qe5
        • 2.Sc6#
        • 2.Qd3#
      • 1...Sa5
        • 2.Rf4#
      • 1...Sd8
        • 2.Rf4#
      • 1...Ke5!
    • 1.Qd3+?
      • 1...Qxd3
        • 2.Rf4#
      • 1...Ke5!
    • 1.Qe4+?
      • 1...Kxe4
        • 2.Rf4#
      • 1...Qxe4!
    • 1.Qg4+?
      • 1...Ke5
        • 2.Qf4#
      • 1...Qxg4
        • 2.Rf4#
      • 1...Qe4!
    • 1.Qf2+?
      • 1...Ke4
        • 2.Rf4#
        • 2.Qf4#
      • 1...Ke5
        • 2.Qf4#
      • 1...Qxf2
        • 2.Rf4#
      • 1...Qe3
        • 2.Rf4#
      • 1...Kc4!
  • Keys
    • 1.Qf1!
      • threat
        • 2.Rf4#
      • 1...Kc4
        • 2.Rf4#
      • 1...Ke4
        • 2.Rf4#
        • 2.Qf4#
      • 1...Ke5
        • 2.Qf4#
      • 1...Qe4
        • 2.Sc6#
      • 1...Qe5
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(c);N_GUARD,SBLOCK::QAR1(C)
  • Tries
    • Try
      • R(G);CHECK,XP(h)
      • Vars
        • Q(c);P_SPINQ(c)::QAR1(C)
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);XQ(C)::B(H)+R(G),DCHECK
        • Q(c);P_PINP(E),XB(F)::B(H)+R(G),DCHECK
        • P(d);XQ(C)::B(H)+R(G),DCHECK
        • P(h);XB(F)::B(H)+R(G),DCHECK
        • Q(c);::B(H)+R(G),DCHECK
        • S(a);::B(H)+R(G),DCHECK
        • Q(c);::S(A)
        • S(g);::B(H)+R(G),DCHECK
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • Q(c);XQ(C)::B(H)+R(G),DCHECK
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(e);P-FLIGHT,XQ(C)::R1(G)
      • Refutation
        • Q(c);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(e);S_FLIGHT::QAB1(C)
        • Q(c);XQ(C)::B(H)+R(G),DCHECK
      • Refutation
        • Q(c);P_SPINQ(c)
    • Try
      • Q(C);CHECK
      • Vars
        • K(e);S_FLIGHT::QAB1(C)
        • Q(c);XQ(C)::B(H)+R(G),DCHECK
        • Q(c);P_SPINQ(c)::B(H)+R(G),DCHECK
      • Refutation
        • K(e);P-FLIGHT
  • Actual
    • Q(C);
    • Threat
      • B(H)+R(G),DCHECK
    • Vars
      • K(e);P-FLIGHT,P_SPINQ(c)::R(G)
      • K(e);S_FLIGHT::QAB1(C)
      • Q(c);SBLOCK::S(A)
      • Q(c);OGATE,SBLOCK::QAR1(C)
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