MESON Chess Problem Database

Problem Display
PID: 963 (q1n1BrN1/2P1BPp1/2pN2R1/1ppk1K2/1b5R/8/1pP5/Q3n3 w - - 0 1)

Petite, Efren

The Problemist Supplement, 1994

q1n1BrN1/2P1BPp1/2pN2R1/1ppk1K2/1b5R/8/1pP5/Q3n3

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf7+
      • 2.Bxf7#
    • 1...Rxg8
      • 2.fxg8Q#
      • 2.fxg8B#
    • 1...Sxc2
      • 2.Qh1#
    • 1...Sd3
      • 2.Qh1#
    • 1...Sxd6+
      • 2.Rxd6#
    • 1...Sxe7+
      • 2.Sxe7#
    • 1...b1Q
      • 2.Qe5#
    • 1...b1S
      • 2.Qe5#
    • 1...b1B
      • 2.Qe5#
    • 1...b1R
      • 2.Qe5#
  • Tries
    • 1.Sxc8?
      • threat
        • 2.Sb6#
        • 2.Rd6#
      • 1...Rxf7+
        • 2.Bxf7#
      • 1...Qb7
        • 2.Rd6#
      • 1...Qa5
        • 2.Bxc6#
        • 2.Rd6#
      • 1...Qa6
        • 2.Rd6#
      • 1...Qa7
        • 2.Bxc6#
        • 2.Rd6#
      • 1...Qb8
        • 2.Bxc6#
        • 2.Rd6#
      • 1...Ba5
        • 2.Rd6#
      • 1...c4
        • 2.Sb6#
      • 1...Qxc8+!
    • 1.Qd1+?
      • 1...Sd3
        • 2.Qf3#
        • 2.Qh1#
        • 2.Qxd3#
      • 1...Bd2!
    • 1.Qxe1?
      • threat
        • 2.Qh1#
        • 2.Qe4#
        • 2.Qe5#
        • 2.Qe6#
      • 1...Rxf7+
        • 2.Bxf7#
      • 1...Sxd6+
        • 2.Rxd6#
      • 1...Sxe7+
        • 2.Sxe7#
      • 1...c4
        • 2.Qe5#
      • 1...b1Q
        • 2.Qe4#
        • 2.Qe5#
        • 2.Qe6#
      • 1...b1R
        • 2.Qe4#
        • 2.Qe5#
        • 2.Qe6#
      • 1...Qa1
        • 2.Qe4#
        • 2.Qe5#
        • 2.Qe6#
      • 1...Qa3
        • 2.Qe4#
        • 2.Qe5#
        • 2.Qe6#
      • 1...Bc3
        • 2.Qh1#
        • 2.Qe4#
        • 2.Qe6#
      • 1...Bxe1!
  • Keys
    • 1.Sxb5!
      • threat
        • 2.c4#
      • 1...Rxf7+
        • 2.Bxf7#
      • 1...Sd6+
        • 2.Rxd6#
      • 1...Sxe7+
        • 2.Sxe7#
      • 1...Sxc2
        • 2.Qh1#
      • 1...cxb5
        • 2.Qxa8#
      • 1...b1Q
        • 2.Qe5#
      • 1...b1B
        • 2.Qe5#
      • 1...Qa2
        • 2.Bxc6#
      • 1...Bc3
        • 2.Sxc3#
      • 1...Sb6
        • 2.Rd6#
      • 1...c4
        • 2.Rd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • R(k);CHECK,OGATE,XP(I)::B(J),XR(k)
    • R(k);N_PINP(I),XS(K)::PXR(k)=Q
    • S(a);OGATE,XP(B)::QAB(A)
    • S(a);OGATE::QAB(A)
    • S(j);CHECK,OGATE,XS(E)::R1(F),XS(j)
    • S(j);CHECK,XB(H)::S(K),XS(j)
    • P(b);N_PINP(I),OGATE,P_PINP(B)::QAR1(A)
    • P(b);OGATE::QAR1(A)
  • Tries
    • Try
      • S(E);XS(j)
      • Threat
        • DUALS(2)
      • Vars
        • R(k);CHECK,OGATE,XP(I)::B(J),XR(k)
        • Q(i);::R1(F)
        • B(c);::R1(F)
        • P(e);::S(E)
      • Refutation
        • Q(i);CHECK,XS(E)
    • Try
      • Q(A);CHECK
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • Q(A);XS(a)
      • Threat
        • DUALS(4)
      • Vars
        • R(k);CHECK,OGATE,XP(I)::B(J),XR(k)
        • S(j);CHECK,OGATE,XS(E)::R1(F),XS(j)
        • S(j);CHECK,XB(H)::S(K),XS(j)
        • P(e);::QAR1(A)
      • Refutation
        • B(c);XQ(A)
  • Actual
    • S(E);XP(d)
    • Threat
      • P(B)
    • Vars
      • R(k);CHECK,OGATE,XP(I)::B(J),XR(k)
      • S(j);CHECK,N_GUARD::R1(F),XS(j)
      • S(j);CHECK,XB(H)::S(K),XS(j)
      • S(a);OGATE,XP(B)::QAB(A)
      • P(g);OGATEB,XS(E)::QAB(A),XQ(i)
      • P(b);N_PINP(I),OGATE,P_PINP(B)::QAR1(A)
      • Q(i);N_GUARD::B(J),XP(g)
      • B(c);N_GUARD::S(E),XB(c)
      • S(j);N_GUARD::R1(F)
      • P(e);N_GUARD::R1(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).