MESON Chess Problem Database

Problem Display
PID: 173736 (8/1pQn3N/1P6/p2kpP2/P3p3/1P1bp2p/2N1P1pB/3R2K1 w - - 0 1)

Boros, Sandor

Pikler, Robert

2nd HM., Shakhmaty, 1926

8/1pQn3N/1P6/p2kpP2/P3p3/1P1bp2p/2N1P1pB/3R2K1

#2

11 + 10

6490 yacpdb 2018
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sc5
      • 2.Sf6#
    • 1...Sxb6
      • 2.Sf6#
    • 1...Sf6
      • 2.Sxf6#
    • 1...Sb8
      • 2.Sf6#
    • 1...Sf8
      • 2.Sf6#
  • Tries
    • 1.Sb4+?
      • 1...Kd4
        • 2.Qc4#
      • 1...axb4!
    • 1.Bg3?
      • 1...Sxb6
        • 2.Sf6#
      • 1...Sc5
        • 2.Sf6#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sb8
        • 2.Sf6#
      • 1...Sf8
        • 2.Sf6#
      • 1...h2+!
    • 1.Bxe5?
      • threat
        • 2.Sxe3#
        • 2.Qd6#
      • 1...Sxe5
        • 2.Sf6#
      • 1...h2+!
    • 1.Rd2?
      • 1...Sxb6
        • 2.Sf6#
      • 1...Sc5
        • 2.Sf6#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sb8
        • 2.Sf6#
      • 1...Sf8
        • 2.Sf6#
      • 1...exd2!
    • 1.Qxe5+?
      • 1...Kc6
        • 2.Qd6#
      • 1...Sxe5!
    • 1.b4?
      • 1...Sxb6
        • 2.Sf6#
        • 2.Qc5#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sf6
        • 2.Sxf6#
        • 2.Qc5#
      • 1...Sb8
        • 2.Sf6#
        • 2.Qc5#
      • 1...Sf8
        • 2.Sf6#
        • 2.Qc5#
      • 1...axb4!
  • Keys
    • 1.Sd4!
      • 1...Kxd4
        • 2.Qc4#
      • 1...Bxe2
        • 2.Sxe2#
      • 1...Sxb6
        • 2.Qxe5#
      • 1...exd4
        • 2.Qd6#
      • 1...Sc5
        • 2.Qxe5#
      • 1...Bb1
        • 2.Sc2#
      • 1...Bc2
        • 2.Sxc2#
      • 1...Bc4
        • 2.bxc4#
      • 1...Bb5
        • 2.Sxb5#
      • 1...Ba6
        • 2.Sb5#
      • 1...Sf6
        • 2.Qxe5#
      • 1...Sb8
        • 2.Qxe5#
      • 1...Sf8
        • 2.Qxe5#

This anticipates 206(1950)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 5
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • S(j);N_GUARD::S(K)
    • S(j);N_GUARD,XP(I)::S(K)
    • S(j);N_GUARD::S(K),XS(j)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(g);P-FLIGHT::QAR1(J)
      • Refutation
        • P(f);XS(C)
    • Try
      • B(E);
      • Vars
        • S(j);N_GUARD,XP(I)::S(K)
        • S(j);N_GUARD::S(K)
        • S(j);N_GUARD::S(K),XS(j)
      • Refutation
        • P(d);CHECK
    • Try
      • B(E);XP(h)
      • Threat
        • DUALS(2)
      • Vars
        • S(j);N_GUARD,XB(E)::S(K)
      • Refutation
        • P(d);CHECK
    • Try
      • R(A);
      • Vars
        • S(j);N_GUARD,XP(I)::S(K)
        • S(j);N_GUARD::S(K)
        • S(j);N_GUARD::S(K),XS(j)
      • Refutation
        • P(c);N_SPINB(b),XR(A)
    • Try
      • Q(J);CHECK,XP(h)
      • Vars
        • K(g);N_SPINB(b),S_FLIGHT::QAR1(J)
      • Refutation
        • S(j);XQ(J)
    • Try
      • P(F);
      • Vars
        • S(j);N_GUARD::QAR1(J),XS(j)
      • Refutation
        • P(f);XP(F)
  • Actual
    • S(C);N_PINB(b)
    • Vars
      • K(g);P-FLIGHT,P_SPINB(b),XS(C)::QAR1(J)
      • B(b);XP(D)::R(A)+S(C),XB(b)
      • S(j);N_GUARD,XP(I)::QAR1(J),XP(h)
      • P(h);SBLOCK,XS(C)::QAR1(J)
      • S(j);N_GUARD,SBLOCK::QAR1(J),XP(h)
      • B(b);::R(A)+S(C)
      • B(b);::R(A)+S(C),XB(b)
      • B(b);OGATE::P(F),XB(b)
      • S(j);N_GUARD::QAR1(J),XP(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).