MESON Chess Problem Database

Problem Display
PID: 79462 (8/3Q4/pp6/b1pN4/2k5/R3P3/3p4/3K4 w - - 0 1)

Davey, David Murray

The Tablet, 1965

(First published on Sat Mar 20 1965)

8/3Q4/pp6/b1pN4/2k5/R3P3/3p4/3K4

#2

5 + 6

5454 Near Snap 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bc3
      • 2.Rxc3#
    • 1...Bb4
      • 2.Sxb6#
  • Tries
    • 1.Sxb6+?
      • 1...Kb4
        • 2.Qa4#
      • 1...Bxb6!
    • 1.Sf6?
      • 1...Kb4
        • 2.Qa4#
      • 1...b5
        • 2.Qg4#
      • 1...Bb4
        • 2.Qd3#
      • 1...Bc3!
    • 1.Sc7?
      • threat
        • 2.Qg4#
      • 1...Kb4
        • 2.Qa4#
      • 1...Bc3!
    • 1.Se7?
      • 1...Kb4
        • 2.Qa4#
      • 1...Bb4
        • 2.Qd3#
      • 1...b5
        • 2.Qg4#
      • 1...Bc3!
    • 1.Qa4+?
      • 1...Bb4
        • 2.Sxb6#
      • 1...Kxd5!
    • 1.Qg4+?
      • 1...Kb5
        • 2.Qa4#
      • 1...Kxd5!
    • 1.Qc6?
      • 1...Bc3
        • 2.Rxc3#
      • 1...Bb4
        • 2.Sxb6#
      • 1...b5!
  • Keys
    • 1.Sb4!
      • 1...Kxb4
        • 2.Qa4#
      • 1...Bxb4
        • 2.Qd3#
      • 1...cxb4
        • 2.Qc6#
      • 1...b5
        • 2.Qg4#

Anticipated by 9408(1902)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(c);N_GUARD::R1(B),XB(c)
    • B(c);N_GUARD,SBLOCK::S(D),XP(f)
  • Tries
    • Try
      • S(D);CHECK,XP(f)
      • Vars
        • K(b);P-FLIGHT::QAR1(E)
      • Refutation
        • B(c);XS(D)
    • Try
      • S(D);
      • Vars
        • K(b);P-FLIGHT::QAR1(E)
        • P(f);SBLOCK::QAR(E)
        • B(c);SBLOCK::QAB1(E)
      • Refutation
        • B(c);
    • Try
      • S(D);
      • Threat
        • QAR(E)
      • Vars
        • K(b);P-FLIGHT::QAR1(E)
      • Refutation
        • B(c);
    • Try
      • S(D);
      • Vars
        • K(b);P-FLIGHT::QAR1(E)
        • B(c);SBLOCK::QAB1(E)
        • P(f);SBLOCK::QAR(E)
      • Refutation
        • B(c);
    • Try
      • Q(E);CHECK
      • Vars
        • B(c);P_SPINB(c)::S(D),XP(f)
      • Refutation
        • K(b);S_FLIGHT,XS(D)
    • Try
      • Q(E);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAB1(E)
      • Refutation
        • K(b);S_FLIGHT,XS(D)
    • Try
      • Q(E);P_PINP(d)
      • Vars
        • B(c);N_GUARD::R1(B),XB(c)
        • B(c);N_GUARD,SBLOCK::S(D),XP(f)
      • Refutation
        • P(f);
  • Actual
    • S(D);
    • Vars
      • K(b);OGATEB,P-FLIGHT,XS(D)::QAR1(E)
      • B(c);SBLOCK,XS(D)::QAB1(E)
      • P(d);OGATEB,SBLOCK,XS(D)::QAR2(E)
      • P(f);SBLOCK::QAR(E)
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