MESON Chess Problem Database

Problem Display
PID: 172040 (2Nr1r2/7B/1p2n3/1R1Pk3/1Q1q2pK/2n3P1/1BN5/b4R2 w - - 0 1)

Apro, Laszlo

La Revue d'Echecs, 1985

2Nr1r2/7B/1p2n3/1R1Pk3/1Q1q2pK/2n3P1/1BN5/b4R2

#2

10 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Qe4#
    • 1...Qc5
      • 2.Qe4#
    • 1...Qd1
      • 2.Qe4#
    • 1...Qd2
      • 2.Qe4#
    • 1...Qe4
      • 2.Qxe4#
    • 1...Qxd5
      • 2.Qe4#
    • 1...Rxd5
      • 2.Qd6#
    • 1...Rd6
      • 2.Qxd6#
    • 1...Rde8
      • 2.Qd6#
    • 1...Sb1
      • 2.Qe1#
    • 1...Sa2
      • 2.Qe1#
    • 1...Sa4
      • 2.Qe1#
    • 1...Sxd5
      • 2.Qe1#
    • 1...Sf4
      • 2.Qxd4#
    • 1...Sc5
      • 2.Qxd4#
    • 1...Sg5
      • 2.Qxd4#
    • 1...Sc7
      • 2.Qxd4#
    • 1...Sg7
      • 2.Qxd4#
  • Tries
    • 1.dxe6+?
      • 1...Kxe6
        • 2.Qe7#
      • 1...Qc5
        • 2.Qe4#
      • 1...Qd5
        • 2.Qe4#
      • 1...Rd5
        • 2.Qd6#
      • 1...Sd5
        • 2.Qe1#
      • 1...Sxb5!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Qxe6#
      • 1...Qxd5
        • 2.Re1#
      • 1...Rxd5
        • 2.Qd6#
      • 1...Sxd5
        • 2.Re1#
      • 1...Rd6
        • 2.Qxd6#
      • 1...Rde8
        • 2.Qd6#
      • 1...Rf6
        • 2.Qxf6#
      • 1...Rfe8
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 13
  • Sets
    • Q(c);OGATE,P_SPINS(b)::QAR1(E)
    • Q(c);OGATE,P_SPINS(b)::QAR1(E),XQ(c)
    • Q(c);OGATE,P_SPINQ(c),P_SPINS(b),XP(H)::QAR1(E)
    • R(h);N_GUARD,P_SPINR(h),XP(H)::QAB1(E)
    • R(h);N_GUARD::QAB1(E),XR(h)
    • R(h);N_GUARD::QAB1(E)
    • S(b);OGATE,P_SPINQ(c)::QAR(E)
    • S(b);OGATE,P_SPINQ(c),P_SPINS(b),XP(H)::QAR(E)
    • S(g);N_GUARD::QAB1(E),XQ(c)
  • Tries
    • Try
      • P(H);CHECK,XS(g)
      • Vars
        • K(e);P-FLIGHT,XP(H)::QAR1(E)
        • Q(c);OGATE,P_SPINQ(c),P_SPINS(b)::QAR1(E)
        • R(h);P_SPINR(h)::QAB1(E)
        • S(b);OGATE,P_SPINQ(c),P_SPINS(b)::QAR(E)
      • Refutation
        • S(b);P_SPINQ(c),XR(G)
  • Actual
    • Q(E);P_PINS(g)
    • Threat
      • QAR1(E),XS(g)
    • Vars
      • Q(c);N_GUARD,N_SPINS(g),P_SPINQ(c),P_SPINS(b),XP(H)::R(A)
      • R(h);N_GUARD,P_SPINR(h),XP(H)::QAB1(E)
      • S(b);N_GUARD,N_SPINS(g),P_SPINQ(c),P_SPINS(b),XP(H)::R(A)
      • R(h);N_GUARD::QAB1(E),XR(h)
      • R(h);N_GUARD::QAB1(E)
      • R(i);N_GUARD::QAB1(E),XR(i)
      • R(i);N_GUARD::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).