MESON Chess Problem Database

Problem Display
PID: 114255 (Q7/2p2K2/3k1N2/5p2/7b/1N2n3/7q/R7 w - - 0 1)

Alisa, S

La Presse, 1896

Q7/2p2K2/3k1N2/5p2/7b/1N2n3/7q/R7

#2

5 + 6

5454 Near Snap 2009
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qd5#
    • 1...Sf1
      • 2.Qd5#
    • 1...Sc2
      • 2.Qd5#
    • 1...Sg2
      • 2.Qd5#
    • 1...Sc4
      • 2.Qd5#
    • 1...Sg4
      • 2.Qd5#
    • 1...Sd5
      • 2.Qxd5#
    • 1...c6
      • 2.Qb8#
  • Tries
    • 1.Se8+?
      • 1...Kd7
        • 2.Sc5#
      • 1...Ke5!
    • 1.Ra6+?
      • 1...c6
        • 2.Qb8#
      • 1...Ke5!
    • 1.Qc6+?
      • 1...Ke5
        • 2.Qxc7#
      • 1...Kxc6!
    • 1.Qa3+?
      • 1...Kc6
        • 2.Qa6#
      • 1...c5
        • 2.Qxc5#
      • 1...Ke5!
    • 1.Qd8+?
      • 1...Ke5
        • 2.Qxc7#
        • 2.Qd4#
      • 1...Kc6!
    • 1.Qe8?
      • threat
        • 2.Qe6#
      • 1...c6
        • 2.Qe7#
        • 2.Qb8#
      • 1...Qe5
        • 2.Qd7#
      • 1...c5!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Qe6#
      • 1...Ke5
        • 2.Qxc7#
      • 1...Kc6
        • 2.Qa6#
      • 1...Qe5
        • 2.Qd7#
      • 1...c5
        • 2.Qxc5#
      • 1...c6
        • 2.Qb8#

Anticipated by 109028(1895)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • S(b);N_GUARD::QAR1(E)
    • S(b);N_GUARD::QAR1(E),XS(b)
    • P(f);OGATEB,SBLOCK::QAB(E)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(e);P-FLIGHT::S(B)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • R(A);CHECK
      • Vars
        • P(f);P_SPINP(f)::QAB(E)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(e);S_FLIGHT::QAB(E),XP(f)
      • Refutation
        • K(e);P-FLIGHT,XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(e);P-FLIGHT::QAR2(E)
        • P(f);P_SPINP(f)::QAB1(E),XP(f)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • Q(a);SBLOCK::QAR1(E)
      • Refutation
        • P(f);
  • Actual
    • Q(E);
    • Threat
      • QAR1(E)
    • Vars
      • K(e);S_FLIGHT::QAB(E),XP(f)
      • K(e);P-FLIGHT,P_SPINP(f)::QAR2(E)
      • Q(a);SBLOCK::QAR1(E)
      • P(f);OGATE::QAB1(E),XP(f)
      • P(f);OGATEB,SBLOCK::QAB(E)
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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).