MESON Chess Problem Database

Problem Display
PID: 238925 (8/6Pb/2n1B1kb/6N1/6N1/3R4/2Q5/1K5R w - - 0 1)

Petite, Efren

L'Italia Scacchistica, 1977

8/6Pb/2n1B1kb/6N1/6N1/3R4/2Q5/1K5R

#2

8 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bxg5
      • 2.Rd7#
    • 1...Bxg7
      • 2.Rd5#
  • Tries
    • 1.Rxh6+?
      • 1...Kxg5
        • 2.Qc1#
        • 2.Qd2#
      • 1...Kxg7!
    • 1.Rf3+?
      • 1...Kxg7
        • 2.Qxh7#
      • 1...Kxg5!
    • 1.Rd8+?
      • 1...Kxg7
        • 2.Qxh7#
      • 1...Kxg5!
    • 1.Qh2?
      • threat
        • 2.Qxh6#
      • 1...Kxg5
        • 2.Qxh6#
      • 1...Bxg5
        • 2.Qxh7#
      • 1...Bxg7
        • 2.Qh5#
      • 1...Kxg7!
    • 1.g8Q+?
      • 1...Bg7
        • 2.Rd5#
      • 1...Bxg8!
    • 1.g8R+?
      • 1...Bg7
        • 2.Rd5#
      • 1...Bxg8!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qf6#
      • 1...Kxg5
        • 2.Qf6#
      • 1...Kxg7
        • 2.Qf6#
      • 1...Bxg5
        • 2.Qf7#
      • 1...Bxg7
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(c);SBLOCK,XS(F)::QAB(C)+R(D)
    • B(c);SBLOCK,XP(H)::QAB(C)+R(D)
  • Tries
    • Try
      • R(B);CHECK,XB(c)
      • Refutation
        • K(b);P-FLIGHT,XP(H)
    • Try
      • R(D);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT,P_PINQ(C),XP(H)::QAR1(C),XB(d)
      • Refutation
        • K(b);P-FLIGHT,P_PINQ(C),XS(F)
    • Try
      • R(D);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT,P_PINQ(C),XP(H)::QAR1(C),XB(d)
      • Refutation
        • K(b);P-FLIGHT,P_PINQ(C),XS(F)
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XB(c)
      • Vars
        • K(b);P-FLIGHT,P_PINR(D),XS(F)::QAB1(C),XB(c)
        • B(c);OGATE,SBLOCK,XS(F)::QAB1(C),XB(d)
        • B(c);SBLOCK,XP(H)::QAB1(C)
      • Refutation
        • K(b);P-FLIGHT,P_PINR(D),XP(H)
    • Try
      • P(H);CHECK
      • Vars
        • B(c);P_SPINB(c)::QAB(C)+R(D)
      • Refutation
        • B(d);XQ(H)
    • Try
      • P(H);CHECK
      • Vars
        • B(c);P_SPINB(c)::QAB(C)+R(D)
      • Refutation
        • B(d);XR(H)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • K(b);P-FLIGHT,P_PINR(D),XS(F)::QAB1(C)
      • K(b);P-FLIGHT,P_PINR(D),XP(H)::QAB1(C)
      • B(c);SBLOCK,XS(F)::QAB1(C)
      • B(c);SBLOCK,XP(H)::QAB1(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).