MESON Chess Problem Database

Problem Display
PID: 225366 (n2B1Rq1/1B1p1pb1/1pp3P1/Rp2k1NP/1Q1N2p1/4P3/8/K7 w - - 0 1)

Aulina, Joaquin

Praca, 1958

n2B1Rq1/1B1p1pb1/1pp3P1/Rp2k1NP/1Q1N2p1/4P3/8/K7

#2

11 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Rxb5#
    • 1...d5
      • 2.Qe7#
    • 1...f5
      • 2.Rxf5#
  • Tries
    • 1.Bc7+?
      • 1...Kd5
        • 2.Rxb5#
        • 2.Qxb5#
        • 2.e4#
      • 1...Kf6
        • 2.Se4#
      • 1...d6
        • 2.Qxd6#
      • 1...Sxc7!
    • 1.Be7?
      • threat
        • 2.Qd6#
      • 1...Kd5
        • 2.Rxb5#
        • 2.Qxb5#
      • 1...d6
        • 2.Qxd6#
      • 1...c5!
    • 1.Rxb5+?
      • 1...cxb5
        • 2.Qe7#
      • 1...d5
        • 2.Qe7#
      • 1...c5!
    • 1.Re8+?
      • 1...Kd5
        • 2.Rxb5#
        • 2.e4#
      • 1...Qxe8!
    • 1.Qc5+?
      • 1...d5
        • 2.Qe7#
      • 1...bxc5!
  • Keys
    • 1.Sxb5!
      • threat
        • 2.Qe4#
      • 1...Kd5+
        • 2.Sc3#
      • 1...Kf5+
        • 2.Sd4#
      • 1...cxb5
        • 2.Qf4#
      • 1...d5
        • 2.Qf4#
      • 1...f5
        • 2.Qd6#
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(c);P-FLIGHT,P_PINS(D)::R(E),XP(b)
    • P(f);N_SPINP(b),SBLOCK::QAR2(C)
    • P(g);OGATE::R1(K),XP(g)
  • Tries
    • Try
      • B(J);CHECK
      • Vars
        • K(c);N_SPINP(b),P_SPINP(g),S_FLIGHT::S(F)
        • P(f);::QAB1(C),XP(f)
      • Refutation
        • S(i);XB(J)
    • Try
      • B(J);
      • Threat
        • QAB1(C)
      • Vars
        • P(f);::QAB1(C),XP(f)
      • Refutation
        • P(e);N_SPINP(b)
    • Try
      • R(E);CHECK,XP(b)
      • Vars
        • P(e);XR(E)::QAR2(C)
        • P(f);P_SPINP(f)::QAR2(C)
      • Refutation
        • P(e);P_SPINP(e)
    • Try
      • R(K);CHECK
      • Refutation
        • Q(j);XR(K)
    • Try
      • Q(C);CHECK,N_PINP(b)
      • Vars
        • P(f);P_SPINP(f),SBLOCK::QAR2(C)
      • Refutation
        • P(d);XQ(C)
  • Actual
    • S(D);XP(b)
    • Threat
      • QAR1(C)
    • Vars
      • K(c);CHECK,P-FLIGHT,P_SPINP(e)::R(E)+S(D),DCHECK
      • K(c);CHECK,P-FLIGHT,P_SPINP(g)::R(E)+S(D),DCHECK
      • P(e);P_SPINP(e),XS(D)::QAB1(C)
      • P(f);SBLOCK::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).