MESON Chess Problem Database

Problem Display
PID: 87684 (7B/2K2n2/R7/3k4/3P4/3Q4/3n4/7b w - - 0 1)

Mortimer, L

American Chess Problemist, 1950

7B/2K2n2/R7/3k4/3P4/3Q4/3n4/7b

#2

5 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Qb5#
    • 1...Se4
      • 2.Qb3#
    • 1...Se5
      • 2.Rd6#
    • 1...Sg5
      • 2.Rd6#
    • 1...Sd6
      • 2.Rxd6#
    • 1...Sh6
      • 2.Rd6#
    • 1...Sd8
      • 2.Rd6#
    • 1...Sxh8
      • 2.Rd6#
  • Tries
    • 1.Qc2?
      • threat
        • 2.Qc6#
      • 1...Sxh8
        • 2.Rd6#
      • 1...Se5
        • 2.Rd6#
      • 1...Sd6
        • 2.Rxd6#
      • 1...Sd8
        • 2.Rd6#
      • 1...Sc4!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Ra5#
        • 2.Qe6#
      • 1...Sxh8
        • 2.Rd6#
      • 1...Se5
        • 2.Rd6#
      • 1...Be4
        • 2.Qb5#
      • 1...Sb3
        • 2.Qe6#
      • 1...Sc4
        • 2.Qe6#
      • 1...Se4
        • 2.Qa2#
      • 1...Sg5
        • 2.Ra5#
        • 2.Rd6#
      • 1...Sd6
        • 2.Rxd6#
      • 1...Sd8
        • 2.Ra5#
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • B(a);SBLOCK::QAR2(A)
    • S(b);N_GUARD,SBLOCK::QAB(A)
    • S(d);N_GUARD::R1(C)
    • S(d);N_GUARD::R1(C),XS(d)
    • S(d);N_GUARD,XB(E)::R1(C)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • S(d);N_GUARD,XB(E)::R1(C)
        • S(d);N_GUARD::R1(C)
        • S(d);N_GUARD::R1(C),XS(d)
      • Refutation
        • S(b);
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • S(d);N_GUARD,XB(E)::R1(C)
      • S(d);N_GUARD::R1(C)
      • B(a);SBLOCK::QAR2(A)
      • S(b);::QAB1(A)
      • S(b);SBLOCK::QAB1(A)
      • S(b);OGATE,SBLOCK::QAB(A)
      • S(d);N_GUARD::R1(C),XS(d)
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