MESON Chess Problem Database

Problem Display
PID: 72702 (B7/2r3P1/1rP3NK/4P3/5Bp1/Q3pkN1/5P1R/2q3n1 w - - 0 1)

Cacciari, Europe

2nd Prize, L'Italia Scacchistica, 1931

B7/2r3P1/1rP3NK/4P3/5Bp1/Q3pkN1/5P1R/2q3n1

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Qxe3#
    • 1...Qa1
      • 2.Qxe3#
    • 1...Qb1
      • 2.Qxe3#
    • 1...Qd1
      • 2.Qxe3#
    • 1...Qf1
      • 2.Qxe3#
    • 1...Qc2
      • 2.Qxe3#
    • 1...Qc4
      • 2.Qxe3#
    • 1...Qxc6
      • 2.Qxe3#
  • Tries
    • 1.Bg5?
      • threat
        • 2.Sh4#
      • 1...Qxc6
        • 2.Qxe3#
      • 1...Rcxc6
        • 2.Qf8#
      • 1...Rbxc6!
    • 1.Qxc1?
      • threat
        • 2.Qxe3#
      • 1...exf2
        • 2.Sh4#
        • 2.Qe3#
        • 2.Qc3#
      • 1...e2
        • 2.Sh4#
        • 2.Qe3#
        • 2.Qc3#
      • 1...Rb3!
    • 1.Qd3?
      • threat
        • 2.Qe4#
        • 2.Qd5#
      • 1...Qxc6
        • 2.Qxe3#
      • 1...Qd2
        • 2.Qe4#
      • 1...Qb1
        • 2.Qxe3#
      • 1...Qd1
        • 2.Qe4#
        • 2.Qxe3#
      • 1...Qc2
        • 2.Qxe3#
      • 1...Qc4
        • 2.Qxe3#
      • 1...Qc5
        • 2.Qe4#
      • 1...Rb5
        • 2.Qe4#
      • 1...Rd7
        • 2.Qe4#
      • 1...Rb4!
  • Keys
    • 1.Bxe3!
      • threat
        • 2.Sh4#
      • 1...Qxe3+
        • 2.Qxe3#
      • 1...Qxc6
        • 2.Bxb6#
      • 1...Rbxc6
        • 2.Bxc1#
      • 1...Rcxc6
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(a);N_GUARD::QAR1(C),XP(c)
    • Q(a);N_GUARD,P_PINS(H),P_SPINQ(a),XP(G)::QAR1(C),XP(c)
  • Tries
    • Try
      • B(E);
      • Threat
        • S(H)
      • Vars
        • Q(a);N_GUARD,P_PINS(H),P_SPINQ(a),XP(G)::QAR1(C),XP(c)
        • R(g);N_GUARD,P_PINS(H),P_SPINR(g),XP(G)::QAR(C)
      • Refutation
        • R(f);P_PINS(H),P_SPINR(f),XP(G)
    • Try
      • Q(C);N_PINP(c),XQ(a)
      • Threat
        • QAR1(C),XP(c)
      • Refutation
        • R(f);
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);N_GUARD,P_PINS(H),P_SPINQ(a),XP(G)::QAR1(C),XP(c)
        • Q(a);::QAB1(C)
        • Q(a);N_GUARD::QAR1(C),XP(c)
        • R(f);::QAB1(C)
        • R(g);::QAB1(C)
      • Refutation
        • R(f);
  • Actual
    • B(E);P_SPINB(E),XP(c)
    • Threat
      • S(H)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XB(E)::QAR1(C),XQ(a)
      • Q(a);N_PINB(E),P_PINS(H),P_SPINQ(a),XP(G)::QAR(C)+B(E),XR(f)
      • R(f);N_GUARD,P_PINS(H),P_SPINR(f),XP(G)::QAR(C)+B(E),XQ(a)
      • R(g);N_GUARD,P_PINS(H),P_SPINR(g),XP(G)::QAR(C)
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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).