MESON Chess Problem Database

Problem Display
PID: 238930 (n2KR1n1/r1P2p1Q/3P1k1p/3R1P2/1pB1pP1P/5q2/1Nb2N2/B5r1 w - - 0 1)

Petite, Efren

4th Prize, 64 Shakhmatnoe obozrenie, 1982

n2KR1n1/r1P2p1Q/3P1k1p/3R1P2/1pB1pP1P/5q2/1Nb2N2/B5r1

#2

13 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rgxa1
      • 2.Qh8#
    • 1...Rb1
      • 2.Qh8#
    • 1...Rc1
      • 2.Qh8#
    • 1...Rd1
      • 2.Qh8#
    • 1...Re1
      • 2.Qh8#
    • 1...Rf1
      • 2.Qh8#
    • 1...Rh1
      • 2.Qh8#
  • Tries
    • 1.Sbd3+?
      • 1...Rgxa1
        • 2.Qh8#
      • 1...Raxa1!
    • 1.Sa4+?
      • 1...Rxa1
        • 2.Qh8#
      • 1...Qc3!
    • 1.Rd1?
      • threat
        • 2.Qxf7#
      • 1...Rxc7
        • 2.Sbd3#
      • 1...Qh5
        • 2.Sa4#
      • 1...Rg7!
    • 1.Ra5?
      • threat
        • 2.Qxf7#
      • 1...Qh5
        • 2.Sbd1#
      • 1...Rg7
        • 2.Sbd3#
      • 1...Rxc7!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Qxf7#
      • 1...Rxc7
        • 2.Sbd1#
      • 1...Qh5
        • 2.Sxe4#
      • 1...Rg7
        • 2.Sa4#

This is a version

(v) by J A Coello.

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • R(a);N_GUARD,XB(A)::QAB(K)
    • R(a);N_GUARD::QAB(K)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • R(a);XB(A)::QAB(K)
      • Refutation
        • R(h);XB(A)
    • Try
      • S(B);CHECK
      • Vars
        • R(a);XB(A)::QAB(K)
      • Refutation
        • Q(c);P_SPINQ(c)
    • Try
      • R(G);
      • Threat
        • QAR1(K),XP(i)
      • Vars
        • R(h);N_GUARD,XP(J)::B(A)+S(B)
        • Q(c);N_GUARD::B(A)+S(B)
      • Refutation
        • R(a);
    • Try
      • R(G);
      • Threat
        • QAR1(K),XP(i)
      • Vars
        • Q(c);N_GUARD::B(A)+S(B)
        • R(a);N_GUARD::B(A)+S(B)
      • Refutation
        • R(h);XP(J)
  • Actual
    • R(G);
    • Threat
      • QAR1(K),XP(i)
    • Vars
      • R(h);N_GUARD,XP(J)::B(A)+S(B)
      • Q(c);N_GUARD::S(C),XP(e)
      • R(a);N_GUARD::B(A)+S(B)
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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).