MESON Chess Problem Database

Problem Display
PID: 68213 (4r1b1/Q2n1pK1/B4NPB/6P1/1R1bp3/4k3/1q1p4/5R1n w - - 0 1)

Vaughan, Colin V

Chess, 1949

4r1b1/Q2n1pK1/B4NPB/6P1/1R1bp3/4k3/1q1p4/5R1n

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Qxd4#
    • 1...Qa3
      • 2.Qxd4#
    • 1...Qb1
      • 2.Qxd4#
    • 1...Qa2
      • 2.Qxd4#
    • 1...Qc2
      • 2.Qxd4#
    • 1...Qb3
      • 2.Rxb3#
      • 2.Qxd4#
    • 1...Re5
      • 2.Sg4#
    • 1...Se5
      • 2.Sd5#
    • 1...Sxf6
      • 2.gxf6#
  • Tries
    • 1.Rb3+?
      • 1...Qc3
        • 2.Rxc3#
      • 1...Qxb3!
    • 1.gxf7?
      • threat
        • 2.g6#
      • 1...Re5
        • 2.Sg4#
      • 1...Sf2!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Qf4#
      • 1...Bxf6+
        • 2.gxf6#
      • 1...Sf2
        • 2.Qg3#
      • 1...Re5
        • 2.Sg4#
      • 1...Be5
        • 2.Rxe4#
      • 1...Se5
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(b);N_GUARD::QAB1(H),XB(e)
    • R(i);N_PINS(E)::S(E)
    • S(g);N_PINS(E)::S(E)
    • S(g);OGATE,XS(E)::B(G)+P(C),XS(g)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::R(B),XQ(b)
      • Refutation
        • Q(b);XR(B)
    • Try
      • P(F);XP(h)
      • Threat
        • B(G)+P(C)
      • Vars
        • R(i);N_PINS(E)::S(E)
      • Refutation
        • S(a);
  • Actual
    • Q(H);N_PINB(e)
    • Threat
      • QAB1(H)
    • Vars
      • B(e);CHECK,OGATE,XS(E)::B(G)+P(C),XB(e)
      • S(a);N_GUARD::QAR2(H)
      • R(i);N_PINS(E)::S(E)
      • B(e);OGATE::R1(B),XP(f)
      • S(g);N_PINS(E)::S(E)
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