MESON Chess Problem Database

Problem Display
PID: 133843 (1R2B1b1/8/q1p4R/NnknK3/2N5/Pr1rp3/Q7/8 w - - 0 1)

Driver, John Edward

The Field, 1962

(First published on Thu May 3 1962)

1R2B1b1/8/q1p4R/NnknK3/2N5/Pr1rp3/Q7/8

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa5
      • 2.Rxc6#
    • 1...Qa7
      • 2.Rxc6#
    • 1...Sb6
      • 2.Rxc6#
  • Tries
    • 1.Sb6?
      • threat
        • 2.Sa4#
        • 2.Sd7#
        • 2.Rxc6#
      • 1...Qxa5
        • 2.Rxc6#
      • 1...Rxa3
        • 2.Qc4#
      • 1...Sxa3
        • 2.Sa4#
        • 2.Sd7#
      • 1...Sxb6
        • 2.Rxc6#
      • 1...Qb7
        • 2.Sa4#
      • 1...Sbc3
        • 2.Sd7#
      • 1...Sd4
        • 2.Sa4#
        • 2.Sd7#
      • 1...Sd6
        • 2.Sa4#
        • 2.Sd7#
      • 1...Sa7
        • 2.Sa4#
        • 2.Sd7#
      • 1...Sbc7
        • 2.Sa4#
        • 2.Sd7#
      • 1...Qc8
        • 2.Sa4#
      • 1...Qa7
        • 2.Sa4#
        • 2.Rxc6#
      • 1...Qa8
        • 2.Sa4#
        • 2.Sd7#
      • 1...Rb4
        • 2.Sd7#
        • 2.Rxc6#
      • 1...Rd4
        • 2.Sxb3#
        • 2.Sd7#
        • 2.Rxc6#
      • 1...Be6
        • 2.Sa4#
      • 1...Sdc3
        • 2.Rxc6#
      • 1...Sb4
        • 2.Sa4#
      • 1...Sf4
        • 2.Sa4#
        • 2.Rxc6#
      • 1...Sf6
        • 2.Sa4#
      • 1...Sdc7
        • 2.Sa4#
        • 2.Rxc6#
      • 1...Se7
        • 2.Sa4#
      • 1...Qxb6!
  • Keys
    • 1.Sb2!
      • threat
        • 2.Sa4#
      • 1...Qxa5
        • 2.Rxc6#
      • 1...Rxb2
        • 2.Qc4#
      • 1...Rxa3
        • 2.Qc4#
      • 1...Rb4
        • 2.Sxd3#
      • 1...Rd4
        • 2.Sxb3#
      • 1...Sbc3
        • 2.Sxb3#
      • 1...Sdc3
        • 2.Sxd3#
      • 1...Sb6
        • 2.Rxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • Q(g);N_GUARD,XS(D)::R1(F),XP(h)
    • Q(g);N_GUARD::R1(F),XP(h)
    • S(f);S_CUTQ(g)::R1(F),XP(h)
  • Tries
    • Try
      • S(C);
      • Threat
        • DUALS(3)
      • Vars
        • Q(g);XS(D)::R1(F),XP(h)
        • R(a);OGATE,XP(B)::QAR1(A)
        • S(f);XS(C)::R1(F),XP(h)
        • Q(g);::S(C)
        • S(d);::S(C)
        • B(i);::S(C)
        • S(f);::R1(F),XP(h)
        • S(f);::S(C)
      • Refutation
        • Q(g);XS(C)
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • Q(g);N_GUARD,XS(D)::R1(F),XP(h)
      • R(a);OGATE,XS(C)::QAR1(A)
      • R(a);OGATE,XP(B)::QAR1(A)
      • R(a);N_GUARD::S(C),XR(b)
      • R(b);N_GUARD::S(D),XR(a)
      • S(d);S_CUTR(b)::S(D),XR(a)
      • S(f);S_CUTR(a)::S(C),XR(b)
      • S(f);S_CUTQ(g)::R1(F),XP(h)
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