MESON Chess Problem Database

Problem Display
PID: 205647 (4R3/qbb3BQ/nr2N2K/5P2/p3k3/r3p3/B2nP3/5R2 w - - 0 1)

Dewfall, EJ

The Observer, 1953

(First published on Sun Jun 14 1953)

4R3/qbb3BQ/nr2N2K/5P2/p3k3/r3p3/B2nP3/5R2

#2

9 + 10

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sxc7#
    • 1...Rb2
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sxc7#
    • 1...Rb3
      • 2.Sxc7#
    • 1...Rb4
      • 2.Sc5#
      • 2.Sg5#
      • 2.Sxc7#
    • 1...Rb5
      • 2.Sc5#
      • 2.Sg5#
    • 1...Rd6
      • 2.Rf4#
    • 1...Rxe6+
      • 2.fxe6#
    • 1...Bc6
      • 2.Sc5#
      • 2.Sg5#
    • 1...Bf4+
      • 2.Rxf4#
    • 1...Be5
      • 2.f6#
    • 1...Bd6
      • 2.Sc5#
      • 2.Sg5#
    • 1...Bd8
      • 2.Rf4#
  • Keys
    • 1.Rd8!
      • threat
        • 2.Rd4#
      • 1...Rxe6+
        • 2.fxe6#
      • 1...Bf4+
        • 2.Rxf4#
      • 1...Bxd8
        • 2.Rf4#
      • 1...Rd3
        • 2.exd3#
      • 1...Rb1
        • 2.Sg5#
      • 1...Rb2
        • 2.Sg5#
      • 1...Rbb3
        • 2.Sg5#
      • 1...Rb4
        • 2.Sg5#
      • 1...Rb5
        • 2.Sg5#
      • 1...Rc6
        • 2.Bd5#
      • 1...Rd6
        • 2.Rf4#
      • 1...Bd5
        • 2.Bxd5#
      • 1...Be5
        • 2.f6#
      • 1...Bd6
        • 2.Sg5#
      • 1...Sb3
        • 2.Bb1#
      • 1...Sf3
        • 2.exf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • R(g);N_PINS(E)::R(I)+S(E),XB(j)
    • R(g);S_CUTB(j)::R1(A)
    • R(g);CHECK,OGATE,P_SPINR(g),XS(E)::QAB(H)+P(D),XR(g)
    • B(j);CHECK,N_GUARD::R1(A),XB(j)
    • B(j);SBLOCK::QAB(H)+P(D)
    • B(j);N_GUARD::R1(A)
  • Actual
    • R(I);
    • Threat
      • R1(I)
    • Vars
      • R(g);CHECK,OGATE,XS(E)::QAB(H)+P(D),XR(g)
      • B(j);CHECK,N_GUARD::R1(A),XB(j)
      • B(j);N_GUARD,XR(I)::R1(A)
      • R(b);OGATE::P(C),XR(b)
      • R(g);N_PINS(E)::S(E)
      • R(g);S_CUTB(i)::B(B)
      • R(g);S_CUTB(j)::R1(A)
      • B(i);N_GUARD::B(B),XB(i)
      • B(j);SBLOCK::QAB(H)+P(D)
      • B(j);N_PINS(E)::S(E)
      • S(a);N_GUARD,S_CUTR(b),S_CUTR(g)::B(B)
      • S(a);OGATE::P(C),XS(a)
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