MESON Chess Problem Database

Problem Display
PID: 27924 (8/8/8/8/R2p4/1nkp4/4Q3/bR1K4 w - - 0 1)

Lebeck, Donald

Mate in Two!! (Lebeck), 1992

8/8/8/8/R2p4/1nkp4/4Q3/bR1K4

#2

4 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Bb2
      • 2.Qxb2#
    • 1...Sc1
      • 2.Qd2#
    • 1...Sd2
      • 2.Qxd2#
    • 1...Sa5
      • 2.Qd2#
    • 1...Sc5
      • 2.Qd2#
    • 1...d2
      • 2.Rc4#
      • 2.Qc4#
  • Tries
    • 1.Qe1+?
      • 1...Sd2
        • 2.Qxd2#
      • 1...d2!
    • 1.Qf2?
      • 1...Bb2
        • 2.Qxb2#
      • 1...Sc1
        • 2.Qxd4#
        • 2.Qd2#
      • 1...Sd2
        • 2.Qxd4#
        • 2.Qxd2#
      • 1...Sa5
        • 2.Qxd4#
        • 2.Qd2#
      • 1...Sc5
        • 2.Qxd4#
        • 2.Qd2#
      • 1...d2!
    • 1.Qg2?
      • 1...Bb2
        • 2.Qxb2#
      • 1...Sc1
        • 2.Qc6#
        • 2.Qd2#
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sa5
        • 2.Qd2#
      • 1...Sc5
        • 2.Qd2#
      • 1...d2!
    • 1.Qh2?
      • 1...Bb2
        • 2.Qxb2#
      • 1...Sc1
        • 2.Qc7#
        • 2.Qd2#
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sa5
        • 2.Qd2#
      • 1...Sc5
        • 2.Qd2#
      • 1...d2!
    • 1.Qe4?
      • 1...Sc1
        • 2.Qc6#
        • 2.Qxd4#
      • 1...Sd2
        • 2.Qxd4#
      • 1...Sa5
        • 2.Qxd4#
      • 1...Sc5
        • 2.Qxd4#
      • 1...d2
        • 2.Qc2#
      • 1...Bb2!
    • 1.Qe7?
      • threat
        • 2.Qb4#
      • 1...Sc5
        • 2.Qxc5#
      • 1...d2!
  • Keys
    • 1.Qa2!
      • threat
        • 2.Rxb3#
        • 2.Qxb3#
      • 1...Bb2
        • 2.Qxb2#
      • 1...Sc1
        • 2.Rxc1#
        • 2.Rc4#
        • 2.Qc4#
        • 2.Qxa1#
        • 2.Qd2#
      • 1...Sd2
        • 2.Rc1#
        • 2.Qxa1#
        • 2.Qxd2#
      • 1...Sa5
        • 2.Rc1#
        • 2.Qxa1#
        • 2.Qd2#
      • 1...Sc5
        • 2.Rc1#
        • 2.Rc4#
        • 2.Qc4#
        • 2.Qxa1#
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • B(a);N_GUARD::QAB1(C),XB(a)
    • S(b);N_GUARD::QAB1(C)
    • S(b);N_GUARD::QAB1(C),XS(b)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAB1(C),XS(b)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • Q(C);
      • Vars
        • B(a);N_GUARD::QAB1(C),XB(a)
      • Refutation
        • P(d);
    • Try
      • Q(C);
      • Vars
        • B(a);N_GUARD::QAB1(C),XB(a)
        • S(b);N_GUARD::QAB1(C),XS(b)
        • S(b);N_GUARD::QAB1(C)
      • Refutation
        • P(d);
    • Try
      • Q(C);
      • Vars
        • B(a);N_GUARD::QAB1(C),XB(a)
        • S(b);N_GUARD::QAB1(C),XS(b)
        • S(b);N_GUARD::QAB1(C)
      • Refutation
        • P(d);
    • Try
      • Q(C);
      • Vars
        • S(b);N_GUARD::QAB1(C),XP(e)
        • P(d);OGATE::QAR1(C)
      • Refutation
        • B(a);
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • S(b);N_GUARD::QAR2(C),XS(b)
      • Refutation
        • P(d);
  • Actual
    • Q(C);
    • Threat
      • DUALS(2)
    • Vars
      • B(a);N_GUARD::QAB1(C),XB(a)
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