MESON Chess Problem Database

Problem Display
PID: 196437 (Bn1b4/1Pn2p2/p1k2r2/B1p2N2/1p3p2/N2R1K2/2Q5/8 w - - 0 1)

Holroyd, GC

The Observer, 1943

(First published on Sun May 16 1943)

Bn1b4/1Pn2p2/p1k2r2/B1p2N2/1p3p2/N2R1K2/2Q5/8

#2

8 + 10

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rd6
      • 2.Rxd6#
    • 1...Be7
      • 2.Sxe7#
    • 1...Sd5
      • 2.Qa4#
    • 1...Se6
      • 2.Rd6#
      • 2.Qa4#
    • 1...Sxa8
      • 2.bxa8Q#
      • 2.bxa8B#
    • 1...Se8
      • 2.Qa4#
    • 1...Sd7
      • 2.b8S#
    • 1...c4
      • 2.Qxc4#
  • Tries
    • 1.Rxd8?
      • threat
        • 2.Sd4#
        • 2.Se7#
      • 1...Sxa8
        • 2.Qe4#
        • 2.bxa8Q#
        • 2.bxa8B#
      • 1...bxa3
        • 2.Sd4#
      • 1...Rd6
        • 2.Se7#
        • 2.Rxd6#
      • 1...Sd7
        • 2.b8S#
      • 1...c4
        • 2.Qxc4#
      • 1...Re6
        • 2.Sd4#
      • 1...Sb5
        • 2.Se7#
        • 2.Qe4#
      • 1...Sd5
        • 2.Sd4#
        • 2.Qa4#
      • 1...Se6
        • 2.Se7#
        • 2.Rd6#
        • 2.Qa4#
        • 2.Qe4#
      • 1...Rxf5!
  • Keys
    • 1.Rd5!
      • threat
        • 2.Qxc5#
      • 1...Kxd5
        • 2.Qe4#
      • 1...Sxd5
        • 2.Qa4#
      • 1...Sxa8
        • 2.bxa8Q#
        • 2.bxa8B#
      • 1...Rd6
        • 2.Rxd6#
      • 1...Be7
        • 2.Sxe7#
      • 1...Se6
        • 2.Rd6#
      • 1...Sd7
        • 2.b8S#
      • 1...c4
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(f);N_GUARD::R1(C),XR(f)
    • B(j);N_GUARD::S(F),XB(j)
    • S(g);N_GUARD::QAB(A)
    • S(g);OGATE,XB(H)::PXS(g)=Q
    • S(i);OGATE::P=S
    • P(c);OGATEB::QAR2(A),XP(c)
  • Tries
    • Try
      • R(C);XB(j)
      • Threat
        • DUALS(2)
      • Vars
        • P(a);XS(B)::S(F)
        • S(i);OGATE::P=S
        • P(c);OGATEB::QAR2(A),XP(c)
        • R(f);::S(F)
      • Refutation
        • R(f);XS(F)
  • Actual
    • R(C);
    • Threat
      • QAR1(A),XP(c)
    • Vars
      • K(e);N_SPINP(c),OGATEB,S_FLIGHT,XR(C)::QAB1(A)
      • S(g);N_GUARD,SBLOCK,XR(C)::QAB(A)
      • S(g);OGATE,XB(H)::PXS(g)=Q
      • R(f);N_GUARD::R1(C),XR(f)
      • B(j);N_GUARD::S(F),XB(j)
      • S(g);S_CUTR(f)::R1(C)
      • S(i);OGATE::P=S
      • P(c);OGATEB::QAR2(A),XP(c)
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