MESON Chess Problem Database

Problem Display
PID: 137752 (2B4b/8/K7/7p/3P3B/1Q3N2/R3N1k1/R4q2 w - - 0 1)

Ellerman, Arnoldo

Budapesti Testnevelesi es Sportbizottsag, 1933

2B4b/8/K7/7p/3P3B/1Q3N2/R3N1k1/R4q2

#2

9 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe2+
      • 2.Rxe2#
    • 1...Qg1
      • 2.Rxg1#
    • 1...Qh1
      • 2.Seg1#
      • 2.Sg3#
      • 2.Sf4#
    • 1...Qf2
      • 2.Sf4#
    • 1...Qxf3
      • 2.Sf4#
  • Tries
    • 1.Bh3+?
      • 1...Kh1
        • 2.Rxf1#
      • 1...Kxh3!
    • 1.Rxf1?
      • threat
        • 2.Sg3#
        • 2.Rg1#
      • 1...Kxf1
        • 2.Sg3#
        • 2.Bh3#
      • 1...Bxd4!
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qh3#
      • 1...Qxe2+
        • 2.Qxe2#
      • 1...Kh1
        • 2.Qh3#
      • 1...Kxf3
        • 2.Bb7#
      • 1...Qxf3
        • 2.Sf4#
      • 1...Qh1
        • 2.Seg1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(a);CHECK,OGATE,P_SPINQ(a),XS(C)::R(B),XQ(a)
    • Q(a);N_PINS(C),OGATE::R1(A),XQ(a)
    • Q(a);N_PINS(C)::S(C)
    • Q(a);N_PINS(C),XS(E)::R(B)+S(C),DCHECK
  • Tries
    • Try
      • B(I);CHECK
      • Vars
        • K(b);P_SPINQ(a),S_FLIGHT::R(A),XQ(a)
      • Refutation
        • K(b);S_FLIGHT,XB(I)
    • Try
      • R(A);N_SPINS(C),XQ(a)
      • Threat
        • DUALS(2)
      • Refutation
        • B(d);XP(F)
  • Actual
    • Q(D);
    • Threat
      • QAB1(D)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XS(C)::QAR2(D),XQ(a)
      • K(b);P_SPINQ(a),S_FLIGHT::QAR2(D)
      • K(b);OGATEB,S_FLIGHT,XS(E)::B(I)
      • Q(a);N_PINS(C),SBLOCK,XS(E)::R(B)+S(C),DCHECK
      • Q(a);N_PINS(C),SBLOCK::R(B)+S(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).