MESON Chess Problem Database

Problem Display
PID: 157388 (b2R1K2/5p2/1p1B1p2/3n2p1/2Pk4/1P1N1P2/2pQB3/2qNb3 w - - 0 1)

Petite, Efren

Die Schwalbe, 1954

b2R1K2/5p2/1p1B1p2/3n2p1/2Pk4/1P1N1P2/2pQB3/2qNb3

#2

10 + 10

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Sxe1#
    • 1...Qa3
      • 2.Sxe1#
    • 1...Qa1
      • 2.Sxe1#
    • 1...Qb1
      • 2.Sxe1#
    • 1...Bf2
      • 2.Sxc1#
    • 1...Bg3
      • 2.Sxc1#
    • 1...Bh4
      • 2.Sxc1#
    • 1...Sc3
      • 2.Bc5#
      • 2.Be5#
    • 1...Se3
      • 2.Bc5#
      • 2.Be5#
    • 1...Sb4
      • 2.Bc5#
      • 2.Be5#
    • 1...Sf4
      • 2.Bc5#
      • 2.Be5#
    • 1...Sc7
      • 2.Bc5#
      • 2.Be5#
    • 1...Se7
      • 2.Bc5#
      • 2.Be5#
    • 1...b5
      • 2.Bc5#
    • 1...f5
      • 2.Be5#
  • Tries
    • 1.Bc7?
      • threat
        • 2.Bxb6#
      • 1...b5
        • 2.Bb6#
      • 1...Qa3+!
    • 1.Qc3+?
      • 1...Sxc3
        • 2.Bc5#
        • 2.Be5#
      • 1...Bxc3!
    • 1.Qe3+?
      • 1...Sxe3
        • 2.Bc5#
        • 2.Be5#
      • 1...Qxe3!
  • Keys
    • 1.Be7!
      • threat
        • 2.Bxf6#
      • 1...Qa3
        • 2.Qe3#
      • 1...Bg3
        • 2.Qc3#
      • 1...f5
        • 2.Bf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_GUARD::QAR(B)+S(E),XB(b)
    • Q(a);N_GUARD,P_PINB(H)::QAR(B)+S(E),XB(b)
    • B(b);N_GUARD::QAR(B)+S(E),XQ(a)
    • P(g);N_GUARD::B(H)
    • P(h);N_GUARD::B(H)
  • Tries
    • Try
      • B(H);P_PINS(e)
      • Threat
        • B(H),XP(g)
      • Vars
        • P(g);::B(H)
      • Refutation
        • Q(a);CHECK
    • Try
      • Q(B);CHECK
      • Refutation
        • B(b);XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • Q(a);XQ(B)
  • Actual
    • B(H);P_PINS(e)
    • Threat
      • B(H),XP(h)
    • Vars
      • Q(a);N_GUARD,P_PINB(H)::QAB1(B)
      • B(b);N_GUARD::QAB1(B)
      • P(h);::B(H)
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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).