MESON Chess Problem Database

Problem Display
PID: 156027 (2bb4/RpnkqRN1/p2P4/2P2r1r/4Q2p/3p1N1B/3P1K2/8 w - - 0 1)

Schirdewan, Udo

Nederlandse Bond van Probleemvrienden, 1932

2bb4/RpnkqRN1/p2P4/2P2r1r/4Q2p/3p1N1B/3P1K2/8

#2

10 + 11

1577 Jaarboek 1932

SOLUTION

  • SOUND
  • Sets
    • 1...Sd5
      • 2.Qa4#
    • 1...Se6
      • 2.Qa4#
    • 1...Sa8
      • 2.Qa4#
    • 1...Se8
      • 2.Qa4#
  • Tries
    • 1.Kg1?
      • threat
        • 2.Se5#
      • 1...Se6
        • 2.Qa4#
      • 1...Rg5+!
    • 1.Kg2?
      • threat
        • 2.Se5#
      • 1...Se6
        • 2.Qa4#
      • 1...Rg5+!
    • 1.Ke3?
      • threat
        • 2.Se5#
      • 1...Se6
        • 2.Qa4#
      • 1...Sd5+!
    • 1.Bxf5+?
      • 1...Se6
        • 2.Se5#
        • 2.Bxe6#
        • 2.Qa4#
      • 1...Rxf5!
    • 1.Qxf5+?
      • 1...Kc6
        • 2.Sd4#
      • 1...Se6
        • 2.Se5#
      • 1...Rxf5!
    • 1.Qf4?
      • threat
        • 2.Se5#
      • 1...Se6
        • 2.Qa4#
      • 1...Kc6!
    • 1.c6+?
      • 1...bxc6
        • 2.Qe6#
      • 1...Kxd6!
  • Keys
    • 1.Ke1!
      • threat
        • 2.Se5#
      • 1...Se6
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • S(g);N_GUARD,P_SPINP(f)::QAB(E)
    • S(g);N_GUARD,N_SPINR(c),P_SPINP(f)::QAB(E)
  • Tries
    • Try
      • K(B);N_SPINS(C),S_FLIGHT
      • Threat
        • S(C)
      • Vars
        • S(g);N_GUARD,N_SPINR(c),P_SPINP(f)::QAB(E)
      • Refutation
        • R(d);CHECK
    • Try
      • K(B);N_SPINS(C),P-FLIGHT
      • Threat
        • S(C)
      • Vars
        • S(g);N_GUARD,N_SPINR(c),P_SPINP(f)::QAB(E)
      • Refutation
        • R(d);CHECK
    • Try
      • K(B);N_SPINS(C),P_SPINQ(E),S_FLIGHT
      • Threat
        • S(C)
      • Vars
        • S(g);N_PINQ(E),N_SPINR(c),P_SPINP(f)::QAB(E)
      • Refutation
        • S(g);CHECK,P_SPINP(f)
    • Try
      • B(D);CHECK,N_SPINS(C),XR(c)
      • Refutation
        • R(d);P_PINS(C),XB(D)
    • Try
      • Q(E);CHECK,N_SPINS(C),XR(c)
      • Vars
        • K(h);N_SPINQ(i),S_FLIGHT::S(C)
        • S(g);P_SPINP(f),P_SPINS(g)::S(C)
      • Refutation
        • R(d);P_PINS(C),P_SPINR(d),XQ(E)
    • Try
      • Q(E);N_SPINS(C)
      • Threat
        • S(C)
      • Vars
        • S(g);N_GUARD,N_SPINR(c),P_SPINP(f)::QAB(E)
      • Refutation
        • K(h);N_SPINQ(i),N_SPINR(c),S_FLIGHT
    • Try
      • P(F);CHECK
      • Vars
        • P(f);P_SPINS(g),SBLOCK,XP(F)::QAB1(E)
      • Refutation
        • K(h);N_SPINQ(i),N_SPINR(c),P-FLIGHT,XP(G)
  • Actual
    • K(B);N_SPINS(C),P_SPINQ(E),S_FLIGHT
    • Threat
      • S(C)
    • Vars
      • S(g);N_PINQ(E),N_SPINR(c),P_SPINP(f)::QAB(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).