MESON Chess Problem Database

Problem Display
PID: 153024 (8/8/8/4Q3/n7/N7/1rR5/kB5K w - - 0 1)

Harley, Brian

The Observer, 1936

(First published on Sun Jan 5 1936)

8/8/8/4Q3/n7/N7/1rR5/kB5K

#2

5 + 3

15290 Harley Scrapbook 2014
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sc5
      • 2.Qxb2#
    • 1...Sb6
      • 2.Qxb2#
  • Tries
    • 1.Kg1?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sc3!
    • 1.Kg2?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sc3!
    • 1.Kh2?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sc3!
    • 1.Rxb2?
      • threat
        • 2.Sc2#
        • 2.Ra2#
      • 1...Sc3
        • 2.Ra2#
      • 1...Sxb2!
    • 1.Rd2?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sc3!
    • 1.Re2?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sc3!
    • 1.Rf2?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sc3!
    • 1.Rg2?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sc3!
    • 1.Rh2?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sc3!
    • 1.Qc3?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sxc3!
    • 1.Qd4?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sc3!
    • 1.Qf6?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sc3!
    • 1.Qg7?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sc3!
    • 1.Qb8?
      • 1...Rxb1+
        • 2.Qxb1#
      • 1...Rxc2
        • 2.Sxc2#
      • 1...Rxb8
        • 2.Ra2#
      • 1...Sc3
        • 2.Qxb2#
      • 1...Ra2
        • 2.Rxa2#
      • 1...Rb3
        • 2.Ra2#
      • 1...Rb4
        • 2.Ra2#
      • 1...Rb5
        • 2.Ra2#
      • 1...Rb6
        • 2.Ra2#
      • 1...Rb7
        • 2.Ra2#
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6!
    • 1.Qh8?
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sc3!
  • Keys
    • 1.Qb5!
      • 1...Rxb1+
        • 2.Qxb1#
      • 1...Rxc2
        • 2.Sxc2#
      • 1...Rxb5
        • 2.Ra2#
      • 1...Sc3
        • 2.Qxb2#
      • 1...Ra2
        • 2.Rxa2#
      • 1...Rb3
        • 2.Ra2#
      • 1...Rb4
        • 2.Ra2#
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAB1(E),XR(b)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b)
    • Try
      • K(B);P_SPINR(C),S_FLIGHT
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b)
    • Try
      • K(B);P-FLIGHT,P_SPINR(C)
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b)
    • Try
      • R(C);XR(b)
      • Threat
        • DUALS(2)
      • Vars
        • S(c);::R1(C)
      • Refutation
        • S(c);P_SPINS(c),XR(C)
    • Try
      • R(C);
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b)
    • Try
      • R(C);
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b)
    • Try
      • R(C);
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b)
    • Try
      • R(C);
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b)
    • Try
      • R(C);
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b)
    • Try
      • Q(E);
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b),XQ(E)
    • Try
      • Q(E);
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b)
    • Try
      • Q(E);
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b)
    • Try
      • Q(E);
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b)
    • Try
      • Q(E);N_PINR(b)
      • Vars
        • R(b);CHECK,OGATE,XB(A)::QAR1(E),XR(b)
        • R(b);XR(C)::S(D),XR(b)
        • R(b);OGATE,XQ(E)::R1(C)
        • S(c);N_GUARD::QAB1(E),XR(b)
        • R(b);OGATE::R1(C),XR(b)
        • R(b);OGATE::R1(C)
      • Refutation
        • S(c);
    • Try
      • Q(E);
      • Vars
        • S(c);N_GUARD::QAB1(E),XR(b)
      • Refutation
        • S(c);N_SPINR(b)
  • Actual
    • Q(E);N_PINR(b)
    • Vars
      • R(b);CHECK,OGATE,XB(A)::QAR1(E),XR(b)
      • R(b);XR(C)::S(D),XR(b)
      • R(b);OGATE,XQ(E)::R1(C)
      • S(c);N_GUARD::QAB1(E),XR(b)
      • R(b);OGATE::R1(C),XR(b)
      • R(b);OGATE::R1(C)
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