MESON Chess Problem Database

Problem Display
PID: 250137 (nBK3b1/R2p4/8/R1Nk2P1/ppNp4/1n3P1q/B7/1Qr5 w - - 0 1)

Tratsaert, R

15th Prize, Kagans Neueste Schachnachrichten, 1927

nBK3b1/R2p4/8/R1Nk2P1/ppNp4/1n3P1q/B7/1Qr5

#2

10 + 10

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc4
      • 2.Qe4#
    • 1...Sa1
      • 2.Qe4#
    • 1...Sxc5
      • 2.Qe4#
  • Tries
    • 1.Se3+?
      • 1...dxe3
        • 2.Qe4#
      • 1...Kc6!
    • 1.Sxb3+?
      • 1...Kxc4
        • 2.Rc5#
      • 1...Kc6
        • 2.Sxd4#
        • 2.Rc5#
      • 1...Ke6!
    • 1.Sxa4+?
      • 1...Kxc4
        • 2.Bxb3#
        • 2.Rc5#
        • 2.Qxb3#
      • 1...Kc6
        • 2.Se5#
      • 1...Sxa5
        • 2.Qe4#
      • 1...Sc5
        • 2.Qe4#
      • 1...Ke6!
    • 1.Sa6+?
      • 1...Kxc4
        • 2.Rc5#
      • 1...Kc6
        • 2.Sxb4#
      • 1...Sxa5
        • 2.Qe4#
      • 1...Sc5
        • 2.Qe4#
      • 1...Ke6!
    • 1.Se6+?
      • 1...Kxc4
        • 2.Rc5#
      • 1...Kc6
        • 2.Sd8#
      • 1...Sxa5
        • 2.Qe4#
      • 1...Sc5
        • 2.Qe4#
      • 1...Kxe6!
    • 1.Sb7+?
      • 1...Kxc4
        • 2.Rc5#
      • 1...Kc6
        • 2.Sd8#
      • 1...Sxa5
        • 2.Qe4#
      • 1...Sc5
        • 2.Qe4#
      • 1...Ke6!
  • Keys
    • 1.Sxd7+!
      • 1...Kxc4
        • 2.Rc5#
      • 1...Kc6
        • 2.Se5#
      • 1...Ke6
        • 2.Sf8#
      • 1...Sxa5
        • 2.Qe4#
      • 1...Sc5
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(a);P_PINS(F),SBLOCK,XS(D)::QAB1(A)
    • S(b);::QAB1(A)
    • S(b);P_SPINS(b),XS(F)::QAB1(A)
  • Tries
    • Try
      • S(D);CHECK,P_PINS(b),P_SPINS(F)
      • Vars
        • P(f);XS(D)::QAB1(A)
      • Refutation
        • K(g);N_PINS(F),N_SPINS(b),S_FLIGHT
    • Try
      • S(F);CHECK,P_SPINS(D),XS(b)
      • Vars
        • K(g);N_GUARD,S_FLIGHT,XS(D)::R1(E)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • S(F);CHECK,P_SPINS(D),XP(d)
      • Vars
        • K(g);N_PINS(D),S_FLIGHT::S(D)
        • S(b);XR(E)::QAB1(A)
        • S(b);N_PINS(D),P_SPINS(b)::QAB1(A)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • S(F);CHECK,P_SPINS(D)
      • Vars
        • K(g);N_GUARD,P_SPINS(b),S_FLIGHT,XS(D)::R1(E)
        • K(g);N_GUARD,N_PINS(D),S_FLIGHT::S(F),XP(e)
        • S(b);XR(E)::QAB1(A)
        • S(b);N_PINS(D),P_SPINS(b)::QAB1(A)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • S(F);CHECK,P_SPINS(D)
      • Vars
        • K(g);N_GUARD,P_SPINS(b),S_FLIGHT,XS(D)::R1(E)
        • K(g);N_GUARD,N_PINS(D),S_CUTS(b),S_CUTS(b),S_FLIGHT::S(F)
        • S(b);XR(E)::QAB1(A)
        • S(b);N_PINS(D),P_SPINS(b)::QAB1(A)
      • Refutation
        • K(g);S_FLIGHT,XS(F)
    • Try
      • S(F);CHECK,P_SPINS(D)
      • Vars
        • K(g);N_GUARD,P_SPINS(b),S_FLIGHT,XS(D)::R1(E)
        • K(g);N_GUARD,N_PINS(D),S_CUTS(b),S_CUTS(b),S_FLIGHT::S(F)
        • S(b);XR(E)::QAB1(A)
        • S(b);N_PINS(D),P_SPINS(b)::QAB1(A)
      • Refutation
        • K(g);S_FLIGHT
  • Actual
    • S(F);CHECK,P_SPINS(D),XP(h)
    • Vars
      • K(g);N_GUARD,P_PINS(F),P_SPINS(b),S_FLIGHT,XS(D)::R1(E)
      • K(g);N_PINS(D),P_PINS(F),S_FLIGHT::S(D)
      • K(g);S_FLIGHT::S(F)
      • S(b);XR(E)::QAB1(A)
      • S(b);N_PINS(D),P_PINS(F),P_SPINS(b)::QAB1(A)
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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).