MESON Chess Problem Database

Problem Display
PID: 190291 (4n1R1/2p2R1p/K1Q2r2/5kp1/1b1P2p1/3Npr2/6N1/8 w - - 0 1)

Holroyd, GC

The Observer, 1938

(First published on Sun Mar 6 1938)

4n1R1/2p2R1p/K1Q2r2/5kp1/1b1P2p1/3Npr2/6N1/8

#2

7 + 10

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rf1
      • 2.Sxe3#
    • 1...Rf2
      • 2.Sxe3#
    • 1...Rf4
      • 2.Sxe3#
    • 1...Sd6
      • 2.Qd5#
    • 1...Sg7
      • 2.Rxf6#
  • Tries
    • 1.Sc5?
      • threat
        • 2.Qe6#
      • 1...Sg7
        • 2.Rxf6#
        • 2.Qxf6#
      • 1...Sd6
        • 2.Qd5#
        • 2.Qd7#
      • 1...Bxc5!
  • Keys
    • 1.Sdf4!
      • threat
        • 2.Qe6#
      • 1...Rxf4
        • 2.Sxe3#
      • 1...gxf4
        • 2.Sh4#
      • 1...Bd6
        • 2.Qc2#
      • 1...Sd6
        • 2.Qd5#
      • 1...Sg7
        • 2.Rxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(b);N_GUARD::S(A),XP(a)
    • S(j);N_PINQ(E)::QAR2(E)
    • S(j);N_GUARD::R1(F),XR(g)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB1(E)
      • Refutation
        • B(c);XS(B)
  • Actual
    • S(B);
    • Threat
      • QAB1(E)
    • Vars
      • R(b);N_GUARD,SBLOCK,XS(B)::S(A),XP(a)
      • P(f);N_GUARD,SBLOCK,XS(B)::S(A)
      • B(c);N_PINQ(E)::QAB(E)
      • S(j);N_PINQ(E)::QAR2(E)
      • S(j);N_GUARD::R1(F),XR(g)
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