MESON Chess Problem Database

Problem Display
PID: 260072 (K1R5/4P3/R1Np4/2Bkp1N1/1Ppp2p1/5q2/6r1/3Q3B w - - 0 1)

Lipton, Michael

Stella Polaris, 1966

K1R5/4P3/R1Np4/2Bkp1N1/1Ppp2p1/5q2/6r1/3Q3B

#2

10 + 8

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...c3
      • 2.Qb3#
    • 1...e4
      • 2.Qxd4#
    • 1...dxc5
      • 2.Rd8#
  • Tries
    • 1.Sxd4?
      • threat
        • 2.Rxd6#
      • 1...exd4
        • 2.Qxd4#
      • 1...dxc5
        • 2.Rxc5#
        • 2.Rd8#
      • 1...c3
        • 2.Qb3#
      • 1...Qa3
        • 2.Sb3#
      • 1...Qf6
        • 2.Sc2#
        • 2.Se2#
        • 2.Sb3#
        • 2.Sb5#
        • 2.Sf5#
        • 2.Sc6#
        • 2.Sde6#
      • 1...Ra2
        • 2.Sc2#
      • 1...e4!
    • 1.Sa5?
      • threat
        • 2.Rxd6#
      • 1...dxc5
        • 2.Rxc5#
        • 2.Rd8#
      • 1...e4
        • 2.Qxd4#
      • 1...Qf6!
    • 1.Sa7?
      • threat
        • 2.Rxd6#
      • 1...dxc5
        • 2.Rxc5#
        • 2.Rd8#
      • 1...c3
        • 2.Qb3#
      • 1...e4
        • 2.Qxd4#
      • 1...Qf6!
    • 1.Qxf3+?
      • 1...e4
        • 2.Qxe4#
        • 2.Qf5#
        • 2.Qf7#
      • 1...gxf3!
    • 1.e8Q?
      • threat
        • 2.Se7#
        • 2.Qe6#
      • 1...c3
        • 2.Qb3#
        • 2.Qe6#
      • 1...Qf5
        • 2.Se7#
      • 1...Qf7
        • 2.Qxf7#
      • 1...Qf8
        • 2.Qe6#
      • 1...e4
        • 2.Qxd4#
        • 2.Qe6#
      • 1...Qf6!
    • 1.e8S?
      • threat
        • 2.Se7#
        • 2.Sc7#
      • 1...dxc5
        • 2.Se7#
        • 2.Rd8#
      • 1...c3
        • 2.Qb3#
      • 1...Qf6
        • 2.Sxf6#
        • 2.Sc7#
      • 1...Qf8
        • 2.Sc7#
      • 1...e4
        • 2.Sc7#
        • 2.Qxd4#
      • 1...Qf7!
  • Keys
    • 1.Bxd4!
      • threat
        • 2.Ra5#
      • 1...c3
        • 2.Qb3#
      • 1...Qa3
        • 2.Bc3#
      • 1...Ra2
        • 2.Bb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • P(c);OGATEB::QAB(A)
    • P(g);N_GUARD::QAR1(A),XP(d)
    • P(h);OGATEB,XB(D)::R(J)
  • Tries
    • Try
      • S(G);XP(d)
      • Threat
        • R1(F),XP(h)
      • Vars
        • P(g);OGATE,P_SPINP(g),XS(G)::QAR1(A),XP(g)
        • P(c);OGATEB::QAB(A)
        • Q(b);N_GUARD,P_PINR(F),P_SPINR(a)::QAR(A)+S(G)
        • R(a);N_GUARD,P_PINR(F),P_SPINQ(b)::QAR(A)+S(G)
      • Refutation
        • P(g);
    • Try
      • S(G);
      • Threat
        • R1(F),XP(h)
      • Vars
        • P(g);N_GUARD::QAR1(A),XP(d)
      • Refutation
        • Q(b);P_SPINR(a)
    • Try
      • S(G);
      • Threat
        • R1(F),XP(h)
      • Vars
        • P(c);OGATEB::QAB(A)
        • P(g);N_GUARD::QAR1(A),XP(d)
      • Refutation
        • Q(b);P_SPINR(a)
    • Try
      • Q(A);CHECK,N_PINP(d),XQ(b)
      • Refutation
        • P(e);XQ(A)
    • Try
      • P(H);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);P_SPINR(a)::S(G)
        • Q(b);N_GUARD,P_SPINR(a)::QAB(H),XQ(b)
        • Q(b);P_SPINR(a)::QAB1(H)
      • Refutation
        • Q(b);P_SPINR(a)
    • Try
      • P(H);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);OGATEB::QAB(A)
        • Q(b);P_SPINR(a)::S(H)
      • Refutation
        • Q(b);P_SPINR(a)
  • Actual
    • B(D);XP(d)
    • Threat
      • R(F)
    • Vars
      • P(c);OGATEB::QAB(A)
      • Q(b);N_GUARD,P_PINR(F),P_SPINR(a)::QAR(A)+B(D)
      • R(a);N_GUARD,P_PINR(F),P_SPINQ(b)::QAR(A)+B(D)
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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).