MESON Chess Problem Database

Problem Display
PID: 197828 (8/7Q/K2b4/p5r1/2k3p1/1N1R4/Nn2rp2/1B6 w - - 0 1)

Holroyd, GC

The Observer, 1944

(First published on Sun May 28 1944)

8/7Q/K2b4/p5r1/2k3p1/1N1R4/Nn2rp2/1B6

#2

6 + 8

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rc2
      • 2.Qe4#
    • 1...Rd2
      • 2.Qe4#
    • 1...Re4
      • 2.Qxe4#
    • 1...Rd5
      • 2.Rc3#
    • 1...Bc5
      • 2.Sxa5#
    • 1...Be5
      • 2.Qf7#
    • 1...Sxd3
      • 2.Qxd3#
  • Tries
    • 1.Sxa5+?
      • 1...Kc5
        • 2.Qa7#
      • 1...Rxa5+!
    • 1.Qc7+?
      • 1...Rc5
        • 2.Sxa5#
      • 1...Bc5
        • 2.Sxa5#
      • 1...Bxc7!
    • 1.Qf7+?
      • 1...Rd5
        • 2.Rc3#
        • 2.Qxd5#
      • 1...Re6!
  • Keys
    • 1.Bc2!
      • threat
        • 2.Rd4#
      • 1...Rxc2
        • 2.Qe4#
      • 1...Sxd3
        • 2.Qxd3#
      • 1...Rd2
        • 2.Qe4#
      • 1...Re4
        • 2.Qxe4#
      • 1...Rd5
        • 2.Rc3#
      • 1...Bc5
        • 2.Sxa5#
      • 1...Be5
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(b);N_GUARD::QAR2(F)
    • R(b);N_GUARD::QAR2(F),XR(b)
    • R(g);SBLOCK::R1(D)
    • B(h);SBLOCK,S_CUTR(g)::S(C),XP(f)
    • B(h);S_CUTR(b),S_CUTR(g)::QAB(F)
    • S(a);OGATE,XR(D)::QAB1(F),XS(a)
  • Tries
    • Try
      • S(C);CHECK,XP(f)
      • Vars
        • K(d);P-FLIGHT::QAB(F)
      • Refutation
        • R(g);CHECK,XS(C)
    • Try
      • Q(F);CHECK
      • Vars
        • R(g);P_SPINR(g)::S(C),XP(f)
        • B(h);P_SPINB(h)::S(C),XP(f)
      • Refutation
        • B(h);XQ(F)
    • Try
      • Q(F);CHECK
      • Refutation
        • R(b);P_SPINR(b)
  • Actual
    • B(A);
    • Threat
      • R1(D)
    • Vars
      • R(b);N_GUARD,XB(A)::QAR2(F)
      • S(a);OGATE,XR(D)::QAB1(F),XS(a)
      • R(b);N_GUARD::QAR2(F)
      • R(b);N_GUARD::QAR2(F),XR(b)
      • R(g);SBLOCK::R1(D)
      • B(h);SBLOCK,S_CUTR(g)::S(C),XP(f)
      • B(h);S_CUTR(b),S_CUTR(g)::QAB(F)
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