MESON Chess Problem Database

Problem Display
PID: 269535 (2B1q3/N1p1n2Q/3k1Nbp/3P3r/2R2P1p/6RP/7B/6K1 w - - 0 1)

Wood, G

The Observer, 1958

(First published on Sun Apr 20 1958)

2B1q3/N1p1n2Q/3k1Nbp/3P3r/2R2P1p/6RP/7B/6K1

#2

11 + 8

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qb5
      • 2.Sxb5#
    • 1...Qf7
      • 2.Sb5#
    • 1...Qxc8
      • 2.Sb5#
    • 1...Qd8
      • 2.Sb5#
    • 1...Qf8
      • 2.Sb5#
    • 1...Qg8
      • 2.Sb5#
    • 1...Qh8
      • 2.Sb5#
    • 1...Sf5
      • 2.Qxc7#
    • 1...Sc6
      • 2.Sb5#
    • 1...Sxc8
      • 2.Qxc7#
    • 1...Sg8
      • 2.Qxc7#
  • Tries
    • 1.Qxe7+?
      • 1...Qxe7
        • 2.Sb5#
        • 2.Rc6#
      • 1...Kxe7!
  • Keys
    • 1.Rd3!
      • threat
        • 2.f5#
      • 1...Rg5+
        • 2.fxg5#
      • 1...Sxd5
        • 2.Qxc7#
      • 1...Sxc8
        • 2.Qxc7#
      • 1...Re5
        • 2.fxe5#
      • 1...Rf5
        • 2.Se4#
      • 1...Bf5
        • 2.Sxe8#
      • 1...Sf5
        • 2.Qxc7#
      • 1...Sc6
        • 2.Sb5#
      • 1...Sg8
        • 2.Qxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 7
  • Sets
    • Q(h);N_GUARD::S(I),XQ(h)
    • Q(h);N_GUARD::S(I)
    • Q(h);N_GUARD,XB(K)::S(I)
    • S(g);OGATE::QAB1(J),XP(f)
    • S(g);S_CUTQ(h)::S(I)
    • S(g);OGATE,XB(K)::QAB1(J),XP(f)
  • Tries
    • Try
      • Q(J);CHECK,XS(g)
      • Refutation
        • K(c);S_FLIGHT,XQ(J)
  • Actual
    • R(C);
    • Threat
      • B(B)+P(F)
    • Vars
      • R(b);CHECK,OGATE::B(B)+P(F),XR(b)
      • S(g);OGATE,P_SPINS(g),XP(G)::QAB1(J),XP(f)
      • S(g);OGATE,XB(K)::QAB1(J),XP(f)
      • R(b);OGATE::P(F),XR(b)
      • R(b);S_CUTB(d)::S(H)
      • B(d);N_GUARD::S(H),XQ(h)
      • S(g);OGATE::QAB1(J),XP(f)
      • S(g);S_CUTQ(h)::S(I)
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