MESON Chess Problem Database

Problem Display
PID: 188435 (1R2r1b1/n1n1p3/2pN2Q1/P1k2N2/8/1rPPb2K/8/7B w - - 0 1)

Stubbs, Arthur Goodwin

The Observer, 1937

(First published on Sun Jul 11 1937)

1R2r1b1/n1n1p3/2pN2Q1/P1k2N2/8/1rPPb2K/8/7B

#2

9 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rb4
      • 2.cxb4#
    • 1...Bc1
      • 2.d4#
    • 1...Bg1
      • 2.Qxg1#
    • 1...Bd2
      • 2.d4#
    • 1...Bd4
      • 2.cxd4#
    • 1...Bf4
      • 2.d4#
    • 1...Bg5
      • 2.d4#
    • 1...Bh6
      • 2.d4#
    • 1...Sab5
      • 2.Sb7#
    • 1...Scb5
      • 2.Sb7#
    • 1...Sd5
      • 2.Se4#
    • 1...exd6
      • 2.Qxd6#
  • Tries
    • 1.Rb5+?
      • 1...Saxb5
        • 2.Sb7#
      • 1...Scxb5
        • 2.Sb7#
      • 1...cxb5
        • 2.Sb7#
      • 1...Rxb5!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Qxe3#
      • 1...exd6
        • 2.Qxd6#
      • 1...Rb4
        • 2.cxb4#
      • 1...Bc1
        • 2.d4#
      • 1...Bg1
        • 2.Qxg1#
      • 1...Bd2
        • 2.d4#
      • 1...Bf2
        • 2.Qxf2#
      • 1...Bd4
        • 2.cxd4#
      • 1...Bf4
        • 2.d4#
      • 1...Bg5
        • 2.d4#
      • 1...Bh6
        • 2.d4#
      • 1...Sab5
        • 2.Sb7#
      • 1...Scb5
        • 2.Sb7#
      • 1...Sd5
        • 2.Se4#
      • 1...Se6
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(a);OGATE::P(B),XR(a)
    • B(b);N_GUARD::P(C)
    • B(b);OGATEB::QAB(H),XB(b)
    • B(b);OGATE::P(B),XB(b)
    • S(e);SBLOCK,S_CUTR(a)::S(G)
    • S(f);SBLOCK,S_CUTR(a)::S(G)
    • S(f);SBLOCK::S(G)
    • P(g);OGATE,XS(G)::QAB1(H),XP(g)
  • Tries
    • Try
      • R(I);CHECK
      • Vars
        • S(e);SBLOCK,XR(I)::S(G)
        • S(f);SBLOCK,XR(I)::S(G)
        • P(d);SBLOCK,XR(I)::S(G)
      • Refutation
        • R(a);XR(I)
  • Actual
    • Q(H);
    • Threat
      • QAB(H),XB(b)
    • Vars
      • P(g);OGATE,XS(G)::QAB1(H),XP(g)
      • R(a);OGATE::P(B),XR(a)
      • B(b);N_GUARD::P(C)
      • B(b);OGATEB::QAB(H),XB(b)
      • B(b);OGATE::P(B),XB(b)
      • S(e);SBLOCK,S_CUTR(a)::S(G)
      • S(f);SBLOCK,S_CUTR(a)::S(G)
      • S(f);SBLOCK::S(G)
      • S(f);N_GUARD,S_CUTB(i)::QAR2(H)
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