MESON Chess Problem Database

Problem Display
PID: 202896 (b3Q3/2pr4/r1k5/3N4/1R1K4/1B4B1/8/8 w - - 0 1)

Maclay, J Neil

The Observer, 1951

(First published on Sun Jan 14 1951)

b3Q3/2pr4/r1k5/3N4/1R1K4/1B4B1/8/8

#2

6 + 5

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Bxa4#
  • Tries
    • 1.Bxc7?
      • 1...Rb6
        • 2.Rxb6#
      • 1...Ra1
        • 2.Rb6#
      • 1...Ra2
        • 2.Rb6#
      • 1...Ra3
        • 2.Rb6#
      • 1...Ra4
        • 2.Bxa4#
      • 1...Ra5
        • 2.Rb6#
      • 1...Ra7
        • 2.Rb6#
      • 1...Bb7!
    • 1.Rc4+?
      • 1...Kb5
        • 2.Rc5#
      • 1...Kb7!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Qxa6#
      • 1...Rxd5+
        • 2.Bxd5#
      • 1...Ra1
        • 2.Rb6#
      • 1...Ra2
        • 2.Rb6#
      • 1...Ra3
        • 2.Rb6#
      • 1...Ra4
        • 2.Bxa4#
      • 1...Ra5
        • 2.Rb6#
      • 1...Rb6
        • 2.Rxb6#
      • 1...Ra7
        • 2.Rb6#
      • 1...Rd6
        • 2.Qxc7#
      • 1...Re7
        • 2.Sxe7#
      • 1...Rf7
        • 2.Qe6#
      • 1...Rg7
        • 2.Qe6#
      • 1...Rh7
        • 2.Qe6#
      • 1...Rd8
        • 2.Qxc7#
      • 1...Bb7
        • 2.Qxb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 14
    • REMOVED MATES = 0
  • Sets
    • R(a);N_GUARD,P_PINR(C)::B(A),XR(a)
  • Tries
    • Try
      • B(B);XP(c)
      • Vars
        • R(a);N_GUARD::R1(C),XR(a)
        • R(a);N_GUARD::R1(C)
        • R(a);N_GUARD,P_PINR(C)::B(A),XR(a)
      • Refutation
        • B(e);
    • Try
      • R(C);CHECK
      • Vars
        • K(b);S_FLIGHT::R1(C)
      • Refutation
        • K(b);N_SPINR(d),S_FLIGHT
  • Actual
    • Q(F);N_PINR(d),P_PINP(c)
    • Threat
      • QAR2(F),XR(a)
    • Vars
      • R(d);CHECK,OGATE,XS(E)::B(A),XR(d)
      • R(a);N_GUARD::R1(C)
      • R(a);N_GUARD,P_PINR(C)::B(A),XR(a)
      • R(a);N_GUARD::R1(C),XR(a)
      • R(d);N_GUARD::QAR1(F),XP(c)
      • R(d);N_PINS(E)::S(E),XR(d)
      • R(d);N_PINS(E),OGATE::QAR2(F)
      • B(e);N_GUARD::QAB1(F),XB(e)
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