MESON Chess Problem Database

Problem Display
PID: 97952 (2B4n/1K1Pb1n1/pp1kq3/3NN1p1/1PP3Q1/2rR4/4R3/1b6 w - - 0 1)

Hermanson, Halvar

Problemas, 1972

2B4n/1K1Pb1n1/pp1kq3/3NN1p1/1PP3Q1/2rR4/4R3/1b6

#2

10 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5+
      • 2.Rxd5#
    • 1...Qxd7+
      • 2.Qxd7#
    • 1...Rxc4
      • 2.Sxc4#
    • 1...Se8
      • 2.dxe8S#
  • Tries
    • 1.Sxc3+?
      • 1...Qd5+
        • 2.Rxd5#
      • 1...Bxd3!
    • 1.Sxb6+?
      • 1...Qd5+
        • 2.Rxd5#
      • 1...Rxd3
        • 2.c5#
      • 1...Bxd3!
    • 1.Qxe6+?
      • 1...Kxe6
        • 2.d8Q#
        • 2.d8R#
      • 1...Sxe6!
    • 1.Qd4?
      • threat
        • 2.Qxb6#
      • 1...Qxd5+
        • 2.Qxd5#
      • 1...Qxd7+
        • 2.Sc7#
      • 1...Rxc4
        • 2.Sxc4#
      • 1...b5
        • 2.Qc5#
        • 2.Qb6#
      • 1...Bd8!
    • 1.d8Q+?
      • 1...Qd7+
        • 2.Qgxd7#
        • 2.Qdxd7#
      • 1...Bxd8!
    • 1.d8R+?
      • 1...Qd7+
        • 2.Rxd7#
        • 2.Qxd7#
      • 1...Bxd8!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Sf7#
      • 1...Qxd5+
        • 2.Sc6#
      • 1...Qxd7+
        • 2.Sxd7#
      • 1...Qxe5
        • 2.Qxe5#
      • 1...Qf7
        • 2.Sxf7#
      • 1...Sf7
        • 2.Sxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(g);CHECK,OGATE,P_SPINQ(g),XS(F)::R1(B),XQ(g)
    • Q(g);CHECK,OGATE,XP(I)::QAR1(E),XQ(g)
    • R(b);XP(D)::S(G),XR(b)
    • S(i);OGATE::PXS(i)=S
  • Tries
    • Try
      • S(F);CHECK,XR(b)
      • Vars
        • Q(g);CHECK,N_GUARD,P_SPINQ(g)::R1(B),XQ(g)
      • Refutation
        • B(a);XR(B)
    • Try
      • S(F);CHECK,XP(e)
      • Vars
        • Q(g);CHECK,N_GUARD,P_SPINQ(g)::R1(B),XQ(g)
        • R(b);XR(B)::P(D)
      • Refutation
        • B(a);XR(B)
    • Try
      • Q(E);CHECK,XQ(g)
      • Vars
        • K(f);P-FLIGHT,XQ(E)::P=Q
      • Refutation
        • S(i);XQ(E)
    • Try
      • Q(E);
      • Threat
        • QAR2(E),XP(e)
      • Vars
        • Q(g);CHECK,OGATE,P_SPINQ(g),XS(F)::QAR1(E),XQ(g)
        • Q(g);CHECK,N_GUARD,XP(I)::QAR(E)+S(F)
        • R(b);XP(D)::S(G),XR(b)
      • Refutation
        • B(h);
    • Try
      • P(I);CHECK
      • Refutation
        • B(h);XQ(I)
    • Try
      • P(I);CHECK
      • Refutation
        • B(h);XR(I)
  • Actual
    • Q(E);
    • Threat
      • QAB(E)+S(G),DCHECK
    • Vars
      • Q(g);CHECK,N_GUARD,P_SPINQ(g),XS(F)::QAB(E)+S(G)
      • Q(g);CHECK,XP(I)::QAB(E)+S(G),XQ(g)
      • Q(g);OGATE,P_SPINQ(g),XS(G)::QAB1(E),XQ(g)
      • Q(g);::QAB(E)+S(G),DCHECK,XQ(g)
      • S(j);::QAB(E)+S(G),DCHECK,XS(j)
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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).