MESON Chess Problem Database

Problem Display
PID: 707 (2b1Rb2/5p1K/3p2n1/1N2q3/2P1k1p1/2PN2R1/5Qn1/8 w - - 0 1)

Gray, Robert

Comm., British Chess Magazine, 1938

2b1Rb2/5p1K/3p2n1/1N2q3/2P1k1p1/2PN2R1/5Qn1/8

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qe7
      • 2.Sxd6#
    • 1...Bf5
      • 2.Qd4#
      • 2.Qxg2#
    • 1...Bh6
      • 2.Sxd6#
    • 1...Bg7
      • 2.Sxd6#
    • 1...Se1
      • 2.Re3#
    • 1...Se3
      • 2.Rxe3#
    • 1...S2h4
      • 2.Re3#
    • 1...f5
      • 2.Qd4#
      • 2.Qxg2#
  • Keys
    • 1.Qxf7!
      • threat
        • 2.Sf2#
      • 1...Qxe8
        • 2.Qd5#
      • 1...Qe6
        • 2.Qxg6#
      • 1...Qe7
        • 2.Sxd6#
      • 1...Bf5
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(d);S_CUTB(i)::S(F),XP(e)
    • B(i);N_GUARD::S(F),XP(e)
    • S(a);N_GUARD::R1(D)
    • S(a);N_GUARD::R1(D),XS(a)
  • Actual
    • Q(A);XP(g)
    • Threat
      • S(C)
    • Vars
      • Q(d);N_SPINQ(d),XR(H)::QAB1(A)
      • Q(d);S_CUTB(h)::QAB(A),XS(f)
      • Q(d);P_PINQ(A),S_CUTB(i)::S(F),XP(e)
      • B(h);SBLOCK::QAB1(A)
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