MESON Chess Problem Database

Problem Display
PID: 187841 (B1b1n1n1/r2P3K/pP1kppN1/2p1N3/8/8/3P3Q/8 w - - 0 1)

Rains, Cyril George

The Observer, 1936

(First published on Sun May 31 1936)

B1b1n1n1/r2P3K/pP1kppN1/2p1N3/8/8/3P3Q/8

#2

8 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd7+
      • 2.Sf7#
    • 1...Bb7
      • 2.d8Q#
      • 2.d8R#
    • 1...Bxd7
      • 2.Sc4#
      • 2.Sf7#
    • 1...Sc7
      • 2.dxc8S#
    • 1...Sg7
      • 2.dxc8S#
    • 1...Se7
      • 2.dxe8S#
  • Tries
    • 1.Qh3?
      • threat
        • 2.Qd3#
      • 1...Bb7
        • 2.d8Q#
        • 2.d8R#
      • 1...c4
        • 2.Qa3#
      • 1...Sc7
        • 2.dxc8S#
      • 1...Se7
        • 2.dxe8S#
      • 1...Rxd7+!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Qd3#
      • 1...Rxd7+
        • 2.Sf7#
      • 1...Bb7
        • 2.d8Q#
        • 2.d8R#
      • 1...c4
        • 2.Qa3#
      • 1...Sc7
        • 2.dxc8S#
      • 1...Se7
        • 2.dxe8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(f);CHECK,SBLOCK,XP(F)::QAB(B)+S(C),DCHECK
    • B(g);N_PINP(F)::P=Q
    • S(h);N_PINP(F)::PXB(g)=S
    • S(i);N_PINP(F)::PXS(h)=S
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • B(g);N_PINP(F)::P=Q
        • P(a);OGATEB::QAB(B)
        • S(h);N_PINP(F)::PXB(g)=S
        • S(i);N_PINP(F)::PXS(h)=S
      • Refutation
        • R(f);CHECK,XP(F)
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • R(f);CHECK,SBLOCK,XP(F)::QAB(B)+S(C),DCHECK
      • B(g);N_PINP(F)::P=Q
      • P(a);OGATEB::QAB(B)
      • S(h);N_PINP(F)::PXB(g)=S
      • S(i);N_PINP(F)::PXS(h)=S
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