MESON Chess Problem Database

Problem Display
PID: 206311 (3n1b2/8/1n5p/2P1Q3/1k6/R1R5/8/2K5 w - - 0 1)

Mari, Alberto

La Sacchierra Enigmistica, 1925

3n1b2/8/1n5p/2P1Q3/1k6/R1R5/8/2K5

#2

5 + 5

6490 yacpdb 2020
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc5
      • 2.Qxc5#
    • 1...Sc4
      • 2.Rcb3#
  • Tries
    • 1.Qd4+?
      • 1...Sc4
        • 2.Rcb3#
        • 2.Qxc4#
      • 1...Kb5!
    • 1.Qf4+?
      • 1...Sc4
        • 2.Qxc4#
      • 1...Kb5!
    • 1.Qe2?
      • threat
        • 2.Qb2#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Sa4!
    • 1.Qe4+?
      • 1...Sc4
        • 2.Qxc4#
      • 1...Kb5!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Qxb6#
      • 1...Kb5
        • 2.Qxb6#
      • 1...Bxc5
        • 2.Qxc5#
      • 1...Sa4
        • 2.Rab3#
      • 1...Sc4
        • 2.Rcb3#
      • 1...Sd5
        • 2.Qa5#
      • 1...Sd7
        • 2.Qa5#
      • 1...Sa8
        • 2.Qa5#
      • 1...Sc8
        • 2.Qa5#

This anticipates 151752(1936)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • B(e);OGATE,XP(D)::QAB1(E),XB(e)
    • S(b);SBLOCK::R1(C)
  • Tries
    • Try
      • Q(E);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR1(E),XS(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);
      • Threat
        • QAR2(E)
      • Vars
        • S(b);N_GUARD::QAR1(E),XS(b)
      • Refutation
        • S(b);
    • Try
      • Q(E);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR1(E),XS(b)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(E);
    • Threat
      • QAR2(E),XS(b)
    • Vars
      • K(a);P-FLIGHT::QAR1(E),XS(b)
      • B(e);OGATE,XP(D)::QAB1(E),XB(e)
      • S(b);SBLOCK::R1(B)
      • S(b);SBLOCK::R1(C)
      • S(b);OGATE::QAB1(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).