MESON Chess Problem Database

Problem Display
PID: 249571 (b2N3B/8/8/5k2/3RN3/6R1/1p3P2/1Q5K w - - 0 1)

Matthaus, Hans Georg

Deutsche Schachzeitung, 1974

b2N3B/8/8/5k2/3RN3/6R1/1p3P2/1Q5K

#2

8 + 3

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe4+
      • 2.Qxe4#
  • Tries
    • 1.Kg1?
      • threat
        • 2.Sd6#
      • 1...Bxe4
        • 2.Qxe4#
      • 1...Kf4!
    • 1.Kh2?
      • threat
        • 2.Sd6#
      • 1...Bxe4
        • 2.Qxe4#
      • 1...Kf4!
    • 1.Sc6?
      • threat
        • 2.Sc5#
        • 2.Sg5#
      • 1...Kf4
        • 2.Sd2#
        • 2.Sc3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sd6#
        • 2.Sf6#
      • 1...Ke6
        • 2.Sg5#
      • 1...Bxc6!
    • 1.Be5?
      • threat
        • 2.Rg5#
      • 1...Bxe4+
        • 2.Qxe4#
      • 1...Kxe5!
    • 1.Rg2?
      • threat
        • 2.Sd6#
      • 1...Bxe4
        • 2.Qxe4#
      • 1...Kf4!
    • 1.Rd5+?
      • 1...Kf4
        • 2.Se6#
      • 1...Bxd5!
    • 1.f3?
      • threat
        • 2.Sd6#
      • 1...Bxe4
        • 2.Qxe4#
      • 1...Kf4!
  • Keys
    • 1.Rdd3!
      • threat
        • 2.Rdf3#
      • 1...Kxe4
        • 2.Rd4#
      • 1...Kf4
        • 2.Rdf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(c);CHECK,OGATE,P_SPINB(c),XS(F)::QAB1(A),XB(c)
  • Tries
    • Try
      • K(B);N_SPINS(F),P-FLIGHT
      • Threat
        • QAB(A)+S(F),DCHECK
      • Vars
        • B(c);OGATE,P_SPINB(c),XS(F)::QAB1(A),XB(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • K(B);N_SPINS(F),P-FLIGHT
      • Threat
        • QAB(A)+S(F),DCHECK
      • Vars
        • B(c);OGATE,P_SPINB(c),XS(F)::QAB1(A),XB(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(G);N_SPINS(F)
      • Threat
        • DUALS(2)
      • Vars
        • K(b);S_FLIGHT::S(F)
      • Refutation
        • B(c);P_PINS(F),XS(G)
    • Try
      • B(H);
      • Threat
        • R1(D)
      • Vars
        • B(c);CHECK,OGATE,P_SPINB(c),XS(F)::QAB1(A),XB(c)
      • Refutation
        • K(b);P-FLIGHT,XB(H)
    • Try
      • R(D);N_SPINS(F)
      • Threat
        • QAB(A)+S(F),DCHECK
      • Vars
        • B(c);OGATE,P_PINR(D),P_SPINB(c),XS(F)::QAB1(A),XB(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(E);CHECK,N_SPINS(F)
      • Vars
        • K(b);P-FLIGHT::S(G)
      • Refutation
        • B(c);P_PINS(F),XR(E)
    • Try
      • P(C);N_SPINS(F)
      • Threat
        • QAB(A)+S(F),DCHECK
      • Vars
        • B(c);OGATE,P_PINP(C),P_SPINB(c),XS(F)::QAB1(A),XB(c)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • R(E);
    • Threat
      • R(E)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XS(F)::QAB(A)+R(E),DCHECK
      • K(b);P-FLIGHT::R1(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).