MESON Chess Problem Database

Problem Display
PID: 187569 (2R5/p2Kp3/8/5p2/R1Nk4/2Nq1P2/1B2P3/1B1r4 w - - 0 1)

Lyness, Robert Cranston

The Observer, 1936

(First published on Sun Mar 8 1936)

2R5/p2Kp3/8/5p2/R1Nk4/2Nq1P2/1B2P3/1B1r4

#2

9 + 6

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Sxd1+?
      • 1...Kd5
        • 2.Ra5#
      • 1...Qc3!
    • 1.Sa2+?
      • 1...Kd5
        • 2.Sb4#
        • 2.Ra5#
      • 1...Qc3!
    • 1.Se4+?
      • 1...Kd5
        • 2.Ra5#
        • 2.Rc5#
      • 1...Qc3!
    • 1.Sd5+?
      • 1...Kxd5
        • 2.Ra5#
      • 1...Qc3!
  • Keys
    • 1.Ke6!
      • threat
        • 2.Sb5#
      • 1...Qxe2+
        • 2.Sxe2#
      • 1...Qxc4+
        • 2.Sd5#
      • 1...Qe4+
        • 2.Sxe4#
      • 1...Qe3+
        • 2.Se5#
      • 1...Qxc3
        • 2.e3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(D);CHECK,XR(a)
      • Vars
        • K(c);P-FLIGHT::R(F)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • S(D);CHECK
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • S(D);CHECK
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • S(D);CHECK
      • Vars
        • K(c);P-FLIGHT,XS(D)::R(F)
      • Refutation
        • Q(b);P_SPINQ(b)
  • Actual
    • K(H);S_FLIGHT
    • Threat
      • B(B)+S(D),DCHECK
    • Vars
      • Q(b);CHECK,XP(C)::B(B)+S(D),DCHECK,XQ(b)
      • Q(b);CHECK,N_GUARD,P_SPINQ(b),XS(G)::B(B)+S(D)
      • Q(b);CHECK,N_GUARD::B(B)+S(D),XQ(b)
      • Q(b);CHECK,N_GUARD,SBLOCK::R(F)+S(G)
      • Q(b);N_GUARD,P_SPINQ(b),XS(D)::P(C)
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