MESON Chess Problem Database

Problem Display
PID: 9792 (2Q2RbB/1K1pr3/RN2k3/1Np4B/6Pp/5n2/7n/1r6 w - - 0 1)

Blake, Percy Francis

3rd Prize, Western Daily Mercury, 1909

2Q2RbB/1K1pr3/RN2k3/1Np4B/6Pp/5n2/7n/1r6

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Re8
      • 2.Rxe8#
      • 2.Qxd7#
      • 2.Qxe8#
    • 1...Sxg4
      • 2.Bxg4#
    • 1...Se5
      • 2.Rf6#
  • Tries
    • 1.Qc7?
      • threat
        • 2.Rf6#
        • 2.Qd6#
      • 1...Rxb5
        • 2.Rf6#
      • 1...Sxg4
        • 2.Bxg4#
        • 2.Qd6#
      • 1...Rf7
        • 2.Qd6#
      • 1...Rg7
        • 2.Qd6#
      • 1...Rh7
        • 2.Qd6#
      • 1...Re8
        • 2.Rxe8#
        • 2.Qd6#
        • 2.Qxd7#
      • 1...Rd1
        • 2.Rf6#
      • 1...Bf7
        • 2.Qd6#
      • 1...d5
        • 2.Sa4#
        • 2.Sc4#
        • 2.Sd7#
        • 2.Sa8#
        • 2.Sc8#
        • 2.Rf6#
      • 1...d6!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qg6#
      • 1...d5+
        • 2.Sd7#
      • 1...d6+
        • 2.Sc7#
      • 1...Rxe8
        • 2.Rxe8#
      • 1...Sxg4
        • 2.Bxg4#
      • 1...Bf7
        • 2.Bxf7#
      • 1...Bh7
        • 2.Bf7#
      • 1...Se5
        • 2.Rf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(b);OGATE,XP(A)::B(C),XS(b)
    • S(c);SBLOCK::R1(H)
  • Tries
    • Try
      • Q(G);N_PINP(g)
      • Threat
        • DUALS(2)
      • Vars
        • R(a);P_PINS(E),XS(B)::R1(H)
        • R(h);::QAR1(G)
        • R(a);::R1(H)
        • B(i);::QAR1(G)
      • Refutation
        • P(g);P_PINQ(G)
  • Actual
    • Q(G);N_PINP(g),P_PINR(h)
    • Threat
      • QAR2(G)
    • Vars
      • P(g);CHECK,SBLOCK::R(D)+S(E)
      • P(g);CHECK,SBLOCK::S(B)
      • R(h);N_SPINR(h),OGATE,XQ(G)::R(H),XR(h)
      • S(b);OGATE,XP(A)::B(C),XS(b)
      • B(i);N_GUARD::B(C),XB(i)
      • B(i);N_GUARD::B(C)
      • S(c);SBLOCK::R1(H)
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