MESON Chess Problem Database

Problem Display
PID: 194893 (2RnQ3/1p4pK/3N1p2/2Bk4/4NP1p/1P5r/1n6/1q6 w - - 0 1)

Gevers, Raymond

1/2 Prize, L'Italia Scacchistica, 1918

2RnQ3/1p4pK/3N1p2/2Bk4/4NP1p/1P5r/1n6/1q6

#2

8 + 9

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4+
      • 2.Qxe4#
    • 1...Sd3
      • 2.Sc3#
    • 1...Sc4
      • 2.bxc4#
    • 1...Sc6
      • 2.Qf7#
      • 2.Qg8#
    • 1...Sf7
      • 2.Qxf7#
    • 1...f5
      • 2.Qe5#
    • 1...g6
      • 2.Sxf6#
  • Tries
    • 1.Rxd8?
      • threat
        • 2.Sc4#
        • 2.Sb5#
        • 2.Sf5#
        • 2.Sxb7#
        • 2.Sf7#
        • 2.Sc8#
      • 1...Qxe4+
        • 2.Sxe4#
      • 1...Sc4
        • 2.Sxc4#
        • 2.bxc4#
      • 1...f5
        • 2.Sc4#
        • 2.Sb5#
        • 2.Sxf5#
        • 2.Sxb7#
        • 2.Sf7#
        • 2.Sc8#
      • 1...b5
        • 2.Sc4#
        • 2.Sxb5#
        • 2.Sf5#
        • 2.Sb7#
        • 2.Sf7#
        • 2.Sc8#
      • 1...b6
        • 2.Sc4#
        • 2.Sb5#
        • 2.Sf5#
        • 2.Sb7#
        • 2.Sf7#
        • 2.Sc8#
      • 1...Rxb3!
    • 1.Qf7+?
      • 1...Se6
        • 2.Qxb7#
      • 1...Sxf7!
    • 1.Qg8+?
      • 1...Sf7
        • 2.Qxf7#
      • 1...Se6!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qf5#
      • 1...Qxe4+
        • 2.Sf5#
      • 1...Sd3
        • 2.Sc3#
      • 1...Sc4
        • 2.bxc4#
      • 1...Sc6
        • 2.Qf7#
      • 1...Se6
        • 2.Qxb7#
      • 1...Sf7
        • 2.Qxf7#
      • 1...f5
        • 2.Qxf5#
      • 1...g6
        • 2.Sxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(a);CHECK,OGATE,XS(B)::QAB1(H),XQ(a)
    • S(b);N_PINS(B)::S(B)
    • S(b);OGATE::P(A),XS(b)
    • S(i);N_GUARD::QAB(H),XS(i)
    • P(f);N_GUARD,N_PINS(B)::QAR1(H)
    • P(h);N_PINS(B)::S(B),XP(f)
  • Tries
    • Try
      • R(G);XS(i)
      • Threat
        • DUALS(6)
      • Vars
        • Q(a);CHECK,XS(B)::R(G)+S(E),XQ(a)
      • Refutation
        • R(c);XP(A)
    • Try
      • Q(H);CHECK
      • Vars
        • S(i);N_GUARD,P_SPINS(i),SBLOCK::QAB(H),XP(g)
      • Refutation
        • S(i);XQ(H)
    • Try
      • Q(H);CHECK
      • Vars
        • S(i);N_GUARD,P_SPINS(i)::QAB(H),XS(i)
      • Refutation
        • S(i);P_SPINS(i)
  • Actual
    • Q(H);
    • Threat
      • QAR2(H)
    • Vars
      • Q(a);CHECK,SBLOCK,XS(B)::QAR(H)+S(E)
      • S(b);N_PINS(B)::S(B)
      • S(b);OGATE::P(A),XS(b)
      • S(i);N_GUARD::QAB(H)
      • S(i);N_GUARD,SBLOCK::QAB(H),XP(g)
      • S(i);N_GUARD::QAB(H),XS(i)
      • P(f);N_PINS(B)::QAR2(H),XP(f)
      • P(h);N_PINS(B)::S(B),XP(f)
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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).