MESON Chess Problem Database

Problem Display
PID: 179928 (7n/1B1p4/2P2K2/3pNpPp/2PNk1PR/1b2P3/1pP1R3/qQ2b2n w - - 0 1)

Gross, Erwin

Freie Presse, 1972

7n/1B1p4/2P2K2/3pNpPp/2PNk1PR/1b2P3/1pP1R3/qQ2b2n

#2

13 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.cxb3#
    • 1...Qa4
      • 2.cxb3#
    • 1...Qa5
      • 2.cxb3#
    • 1...Qa6
      • 2.cxb3#
    • 1...Qa7
      • 2.cxb3#
    • 1...Qa8
      • 2.cxb3#
    • 1...Bd2
      • 2.gxf5#
    • 1...Bc3
      • 2.gxf5#
    • 1...Bb4
      • 2.gxf5#
    • 1...Ba5
      • 2.gxf5#
    • 1...Bxc2
      • 2.Qxc2#
    • 1...Sg3
      • 2.gxf5#
    • 1...dxc4
      • 2.cxd7#
  • Tries
    • 1.Sxb3?
      • threat
        • 2.Sc5#
      • 1...dxc4
        • 2.cxd7#
      • 1...Qa3
        • 2.c3#
      • 1...Qa5
        • 2.c3#
      • 1...Qa7
        • 2.c3#
      • 1...Bb4
        • 2.gxf5#
      • 1...d6!
    • 1.Sb5?
      • threat
        • 2.Sd6#
      • 1...dxc4
        • 2.cxd7#
      • 1...Qa3
        • 2.cxb3#
      • 1...Bb4
        • 2.gxf5#
      • 1...d6
        • 2.Sxd6#
      • 1...Sf7!
    • 1.Sxf5?
      • threat
        • 2.Sd6#
      • 1...dxc4
        • 2.cxd7#
      • 1...Qa3
        • 2.cxb3#
      • 1...Bb4
        • 2.gxh5#
      • 1...d6
        • 2.Sxd6#
      • 1...Sf7!
    • 1.c3+?
      • 1...Bc2
        • 2.Qxc2#
      • 1...Qxb1!
    • 1.gxh5+?
      • 1...f4
        • 2.Rxf4#
      • 1...Bxh4!
  • Keys
    • 1.Sxd7!
      • threat
        • 2.Sc5#
      • 1...dxc4
        • 2.c7#
      • 1...Qa3
        • 2.cxb3#
      • 1...Qa5
        • 2.cxb3#
      • 1...Qa7
        • 2.cxb3#
      • 1...Bb4
        • 2.gxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 8
  • Sets
    • Q(a);N_GUARD::QAB(A)+P(B),XB(e)
    • Q(a);N_GUARD,P_PINP(K)::QAB(A)+P(B),XB(e)
    • B(b);N_GUARD::R(H)+P(G),XP(h)
    • B(e);OGATE,P_SPINB(e),XP(B)::QAB(A),XB(e)
    • S(c);S_CUTB(b)::R(H)+P(G),XP(h)
    • P(g);XP(E)::B(M)+P(K),XP(j)
  • Tries
    • Try
      • S(F);XB(e)
      • Threat
        • S(F)
      • Vars
        • P(g);XP(E)::B(M)+P(K),XP(j)
        • Q(a);N_GUARD::QAB(A)+P(B)
        • B(b);N_GUARD::R(H)+P(G),XP(h)
      • Refutation
        • P(j);
    • Try
      • S(F);
      • Threat
        • S(F)
      • Vars
        • P(g);XP(E)::B(M)+P(K),XP(j)
        • Q(a);N_GUARD::QAB(A)+P(B),XB(e)
        • B(b);N_GUARD::R(H)+P(G),XP(h)
        • P(j);::S(F),XP(j)
      • Refutation
        • S(k);
    • Try
      • S(F);XP(h)
      • Threat
        • S(F)
      • Vars
        • P(g);XP(E)::B(M)+P(K),XP(j)
        • Q(a);N_GUARD::QAB(A)+P(B),XB(e)
        • B(b);N_GUARD::R(H)+P(G),XP(i)
        • P(j);::S(F),XP(j)
      • Refutation
        • S(k);
    • Try
      • P(B);CHECK
      • Vars
        • B(e);N_GUARD,P_SPINB(e)::QAB(A),XB(e)
      • Refutation
        • Q(a);XQ(A)
    • Try
      • P(G);CHECK,XP(i)
      • Vars
        • P(h);P_SPINP(h)::R1(H),XP(h)
      • Refutation
        • B(b);P_PINP(J),XR(H)
  • Actual
    • S(I);XP(j)
    • Threat
      • S(I)
    • Vars
      • P(g);XP(E)::B(M)+P(K)
      • Q(a);N_GUARD::QAB(A)+P(B),XB(e)
      • B(b);N_GUARD::R(H)+P(G),XP(h)
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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).