MESON Chess Problem Database

Problem Display
PID: 164964 (8/2p5/N7/5K2/1RBPQp2/1bk5/R3P3/2rr1N2 w - - 0 1)

Holroyd, GC

The Observer, 1927

(First published on Sun Jan 23 1927)

8/2p5/N7/5K2/1RBPQp2/1bk5/R3P3/2rr1N2

#2

9 + 6

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Qd3#
    • 1...Rxf1
      • 2.Qd3#
    • 1...Rd3
      • 2.Qxd3#
  • Tries
    • 1.Bxb3?
      • threat
        • 2.Qc6#
      • 1...Rxd4
        • 2.Qxd4#
      • 1...c6
        • 2.Qxc6#
      • 1...c5!
    • 1.Qf3+?
      • 1...Rd3
        • 2.Qxd3#
      • 1...Kxd4!
    • 1.Qe3+?
      • 1...Rd3
        • 2.Qxd3#
      • 1...fxe3!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Bxb3#
      • 1...Bc2+
        • 2.Bd3#
      • 1...Kxd4
        • 2.Qf6#
      • 1...Rxd4
        • 2.Rxb3#
      • 1...Bxa2
        • 2.Bxa2#
      • 1...Bxc4
        • 2.Qxc4#
      • 1...Ba4
        • 2.Bb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • R(b);N_GUARD::QAR1(G)
    • R(b);N_GUARD,XS(A)::QAR1(G)
    • R(b);N_GUARD::QAR1(G),XR(b)
  • Tries
    • Try
      • B(E);XB(c)
      • Threat
        • QAR(G)
      • Vars
        • R(b);OGATE,XP(F)::QAB1(G),XR(b)
        • P(f);::QAR(G),XP(f)
      • Refutation
        • P(f);
    • Try
      • Q(G);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAR1(G),XR(b)
      • Refutation
        • K(d);S_FLIGHT,XP(F)
    • Try
      • Q(G);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAR1(G),XR(b)
      • Refutation
        • P(e);XQ(G)
  • Actual
    • Q(G);
    • Threat
      • QAR(G)+B(E),XB(c)
    • Vars
      • B(c);CHECK,N_GUARD::QAR(G)+B(E)
      • K(d);OGATEB,S_FLIGHT,XP(F)::QAB(G)
      • R(b);SBLOCK,XP(F)::R1(D),XB(c)
      • B(c);OGATE,XR(B)::QAR(G)+B(E),XB(c)
      • B(c);OGATE,P_SPINB(c),XB(E)::QAR1(G),XB(c)
      • B(c);N_GUARD::QAR(G)+B(E)
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