MESON Chess Problem Database

Problem Display
PID: 101225 (4n1NB/3Q1B1k/8/8/6K1/8/8/8 w - - 0 1)

Seplowin, Samuel

Good Companions, 1918

4n1NB/3Q1B1k/8/8/6K1/8/8/8

#2

5 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Ba2+?
      • 1...Kg6
        • 2.Bb1#
        • 2.Qf5#
        • 2.Qd3#
        • 2.Qf7#
      • 1...Sg7
        • 2.Qxg7#
      • 1...Kxh8!
    • 1.Bb3+?
      • 1...Kg6
        • 2.Bc2#
        • 2.Qf5#
        • 2.Qd3#
        • 2.Qf7#
      • 1...Sg7
        • 2.Qxg7#
      • 1...Kxh8!
    • 1.Bc4+?
      • 1...Kg6
        • 2.Bd3#
        • 2.Qf5#
        • 2.Qd3#
        • 2.Qf7#
      • 1...Sg7
        • 2.Qxg7#
      • 1...Kxh8!
    • 1.Bd5+?
      • 1...Kg6
        • 2.Be4#
        • 2.Qf5#
        • 2.Qf7#
      • 1...Sg7
        • 2.Qxg7#
      • 1...Kxh8!
    • 1.Be6+?
      • 1...Kg6
        • 2.Bf5#
        • 2.Qd3#
        • 2.Qf7#
      • 1...Sg7
        • 2.Qxg7#
      • 1...Kxh8!
    • 1.Bxe8+?
      • 1...Kxg8
        • 2.Qg7#
      • 1...Kxh8!
    • 1.Qc6?
      • threat
        • 2.Qh1#
        • 2.Qh6#
      • 1...Kxh8
        • 2.Qh6#
      • 1...Sd6
        • 2.Qh1#
      • 1...Sg7
        • 2.Qh6#
      • 1...Sf6+!
    • 1.Qe6?
      • threat
        • 2.Qh6#
      • 1...Kxh8
        • 2.Qh6#
      • 1...Sf6+!
    • 1.Qd2?
      • threat
        • 2.Qh6#
        • 2.Qh2#
      • 1...Kxh8
        • 2.Qh6#
      • 1...Sg7
        • 2.Qh6#
      • 1...Sf6+!
    • 1.Qd4?
      • 1...Sg7
        • 2.Qxg7#
      • 1...Sd6
        • 2.Qg7#
      • 1...Sc7
        • 2.Qg7#
      • 1...Sf6+!
  • Keys
    • 1.Bg6+!
      • 1...Kxg6
        • 2.Qf5#
      • 1...Kxg8
        • 2.Qxe8#
      • 1...Kxh8
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR1(B),XS(b)
      • Refutation
        • K(a);P-FLIGHT,XB(E)
    • Try
      • B(C);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR1(B),XS(b)
      • Refutation
        • K(a);P-FLIGHT,XB(E)
    • Try
      • B(C);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR1(B),XS(b)
      • Refutation
        • K(a);P-FLIGHT,XB(E)
    • Try
      • B(C);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR1(B),XS(b)
      • Refutation
        • K(a);P-FLIGHT,XB(E)
    • Try
      • B(C);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR1(B),XS(b)
      • Refutation
        • K(a);P-FLIGHT,XB(E)
    • Try
      • B(C);CHECK,XS(b)
      • Vars
        • K(a);S_FLIGHT,XS(D)::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT,XB(E)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT,XB(E)::QAR2(B)
        • S(b);::QAR(B)
        • S(b);::QAR1(B)
      • Refutation
        • S(b);CHECK
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • K(a);P-FLIGHT,XB(E)::QAR2(B)
      • Refutation
        • S(b);CHECK
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT,XB(E)::QAR2(B)
        • S(b);::QAR1(B)
      • Refutation
        • S(b);CHECK
    • Try
      • Q(B);
      • Vars
        • S(b);N_GUARD::QAR1(B),XS(b)
        • S(b);N_GUARD::QAR1(B)
      • Refutation
        • S(b);CHECK
  • Actual
    • B(C);CHECK
    • Vars
      • K(a);S_FLIGHT,XB(C)::QAB1(B)
      • K(a);S_FLIGHT,XS(D)::QAR2(B),XS(b)
      • K(a);P-FLIGHT,XB(E)::QAR1(B)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).