MESON Chess Problem Database

Problem Display
PID: 175178 (K4B2/8/8/2pk4/8/8/2BnQ3/8 w - - 0 1)

Lybeck, Carl A

Boston Sunday Post, 1902

K4B2/8/8/2pk4/8/8/2BnQ3/8

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Qe4#
    • 1...Sf1
      • 2.Qe4#
    • 1...Sb3
      • 2.Qe4#
    • 1...Sf3
      • 2.Qe4#
    • 1...Sc4
      • 2.Qe4#
    • 1...Se4
      • 2.Qxe4#
  • Tries
    • 1.Qd3+?
      • 1...Ke5
        • 2.Qd6#
      • 1...Ke6
        • 2.Qf5#
      • 1...Kc6!
    • 1.Qh5+?
      • 1...Kc4
        • 2.Qxc5#
      • 1...Kd4
        • 2.Qxc5#
      • 1...Ke6
        • 2.Qf5#
      • 1...Kc6!
    • 1.Qe6+?
      • 1...Kd4
        • 2.Bg7#
      • 1...Kxe6!
  • Keys
    • 1.Qe7!
      • 1...Kc4
        • 2.Qxc5#
      • 1...Kd4
        • 2.Qxc5#
      • 1...Kc6
        • 2.Qb7#
      • 1...c4
        • 2.Qd6#
      • 1...Sb1
        • 2.Qe4#
      • 1...Sf1
        • 2.Qe4#
      • 1...Sb3
        • 2.Qe4#
      • 1...Sf3
        • 2.Qe4#
      • 1...Sc4
        • 2.Qe4#
      • 1...Se4
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);OGATE,P-FLIGHT::QAB1(B)
        • K(c);S_FLIGHT::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT::QAR1(B),XP(b)
        • K(c);OGATE,P-FLIGHT::QAB1(B),XP(b)
        • K(c);S_FLIGHT::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT::B(D)
      • Refutation
        • K(c);S_FLIGHT,XQ(B)
  • Actual
    • Q(B);
    • Vars
      • K(c);S_FLIGHT::QAR1(B),XP(b)
      • K(c);P-FLIGHT::QAB1(B),XP(b)
      • K(c);S_FLIGHT::QAB1(B)
      • P(b);SBLOCK::QAR1(B)
      • S(a);N_GUARD::QAB1(B)
      • S(a);N_GUARD::QAB1(B),XS(a)
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