MESON Chess Problem Database

Problem Display
PID: 222906 (1nR1RB2/3b2n1/1K1NrpQ1/2N1k3/2P2p2/2P1q3/8/b7 w - - 0 1)

May, Willy Paul

Suomen Shakki, 1948

1nR1RB2/3b2n1/1K1NrpQ1/2N1k3/2P2p2/2P1q3/8/b7

#2

9 + 9

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Sd3#
      • 2.Qe4#
    • 1...Qg1
      • 2.Qe4#
    • 1...Qd2
      • 2.Qe4#
    • 1...Qf2
      • 2.Qe4#
    • 1...Qxc5+
      • 2.Rxc5#
    • 1...Qe1
      • 2.Sd3#
    • 1...Qxc3
      • 2.Qe4#
    • 1...Qd3
      • 2.Sxd3#
    • 1...Qg3
      • 2.Qe4#
    • 1...Qh3
      • 2.Qe4#
    • 1...Qe4
      • 2.Qxe4#
    • 1...Re7
      • 2.Sf7#
    • 1...Rxe8
      • 2.Sf7#
    • 1...Bc6
      • 2.Sf7#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sh5
      • 2.Qf5#
    • 1...Sxe8
      • 2.Qf5#
    • 1...Sc6
      • 2.Sf7#
    • 1...f5
      • 2.Qxg7#
  • Tries
    • 1.Rxe6+?
      • 1...Sxe6
        • 2.Sf7#
        • 2.Qf5#
      • 1...Bxe6!
    • 1.Qg5+?
      • 1...Sf5
        • 2.Qxf5#
      • 1...f5
        • 2.Qxg7#
      • 1...fxg5!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qd5#
      • 1...Qxc5+
        • 2.Rxc5#
      • 1...Qxd3
        • 2.Sxd3#
      • 1...f3
        • 2.Qxe3#
      • 1...f5
        • 2.Bxg7#
      • 1...Qd2
        • 2.Qe4#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Qf3
        • 2.Qd4#
      • 1...Qe4
        • 2.Qxe4#
      • 1...Bc6
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 12
  • Sets
    • Q(b);N_GUARD::QAR1(F)
    • Q(b);N_GUARD,N_PINS(C),P_PINS(E)::QAR1(F)
    • Q(b);CHECK,OGATE,P_PINS(E),XS(C)::R(G),XQ(b)
    • Q(b);N_PINS(C),P_PINS(E)::S(C)
    • Q(b);N_GUARD,N_PINS(C),P_PINS(E),XP(A)::QAR1(F)
    • Q(b);N_PINS(C),P_PINS(E)::S(C),XQ(b)
    • Q(b);N_GUARD,N_PINS(C),P_PINS(E)::QAR1(F),XQ(b)
    • R(e);::S(E)
    • R(e);N_SPINR(e),XR(H)::S(E)
    • B(g);::S(E)
    • S(h);N_GUARD::QAR1(F),XS(h)
    • S(h);N_GUARD::QAR1(F)
    • S(h);N_GUARD,N_SPINR(e),XR(H)::QAR1(F)
    • S(i);::S(E)
    • P(f);OGATEB::QAB(F),XS(h)
  • Tries
    • Try
      • R(H);CHECK,XR(e)
      • Refutation
        • B(g);XR(H)
    • Try
      • Q(F);CHECK
      • Vars
        • S(h);N_GUARD,P_SPINS(h)::QAR1(F),XS(h)
        • P(f);OGATEB,P_SPINP(f)::QAB(F),XS(h)
      • Refutation
        • P(f);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • QAR1(F)
    • Vars
      • Q(b);CHECK,OGATE,P_PINS(E),XS(C)::R(G),XQ(b)
      • Q(b);N_PINS(C),P_PINS(E),XQ(F)::S(C),XQ(b)
      • P(c);N_GUARD::QAR2(F),XQ(b)
      • P(f);OGATEB::B(I),XS(h)
      • Q(b);N_GUARD,N_PINS(C),P_PINS(E)::QAR1(F)
      • Q(b);N_GUARD::QAB1(F),XQ(b)
      • Q(b);N_GUARD,N_PINS(C),P_PINS(E)::QAB1(F)
      • Q(b);N_GUARD,N_PINS(C),P_PINS(E)::QAR1(F),XQ(b)
      • B(g);::S(E)
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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).