MESON Chess Problem Database

Problem Display
PID: 1134 (2R5/2b5/1P3B2/r1p1N2K/1r1P2p1/QPk2pR1/PpNpP3/1n1B4 w - - 0 1)

McWilliam, Robert C

Problem Observer, 1979

2R5/2b5/1P3B2/r1p1N2K/1r1P2p1/QPk2pR1/PpNpP3/1n1B4

#2

13 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb3
      • 2.Qxb3#
    • 1...Bxe5
      • 2.Qxb4#
    • 1...Bxb6
      • 2.Qxb4#
    • 1...Bd6
      • 2.Qxb4#
    • 1...Bb8
      • 2.Qxb4#
    • 1...Bd8
      • 2.Qxb4#
    • 1...cxd4
      • 2.Qxb4#
    • 1...c4
      • 2.Qxb4#
  • Tries
    • 1.Kxg4?
      • threat
        • 2.Rxf3#
      • 1...cxd4
        • 2.Qxb4#
      • 1...Rxd4+!
    • 1.Qxa5?
      • 1...Bxe5
        • 2.Rxc5#
        • 2.Qxb4#
      • 1...Bxb6
        • 2.Qxb4#
      • 1...cxd4
        • 2.Rxc7#
        • 2.Qxb4#
      • 1...Bd6
        • 2.Qxb4#
      • 1...Bb8
        • 2.Rxc5#
        • 2.Qxb4#
      • 1...Bd8
        • 2.Rxc5#
        • 2.Qxb4#
      • 1...c4
        • 2.Qxb4#
      • 1...Sa3!
    • 1.exf3?
      • threat
        • 2.fxg4#
        • 2.f4#
      • 1...Bxe5
        • 2.f4#
      • 1...gxf3
        • 2.Rxf3#
      • 1...cxd4
        • 2.Qxb4#
      • 1...Rxd4!
  • Keys
    • 1.Sxf3!
      • threat
        • 2.Se5#
      • 1...cxd4+
        • 2.Sg5#
      • 1...Rxd4
        • 2.Qxa5#
      • 1...Bxg3
        • 2.Qxb4#
      • 1...gxf3
        • 2.Rxf3#
      • 1...Bf4
        • 2.Qxb4#
      • 1...Be5
        • 2.Sxe5#
        • 2.Qxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • R(f);OGATE,P_SPINR(f),XP(F)::QAR1(E),XR(f)
    • B(j);S_CUTP(i),XS(I)::QAB1(E),XR(f)
    • B(j);S_CUTP(i),XP(K)::QAB1(E),XR(f)
    • B(j);S_CUTP(i)::QAB1(E),XR(f)
    • P(i);N_GUARD,P_PINS(I),P_SPINB(j),XP(H)::QAB1(E),XR(f)
    • P(i);N_GUARD,P_PINS(I)::QAB1(E),XR(f)
  • Tries
    • Try
      • K(J);P_SPINP(H),S_FLIGHT,XP(g)
      • Threat
        • R(G),XP(e)
      • Vars
        • P(i);N_GUARD,P_SPINB(j),XP(H)::QAB1(E),XR(f)
      • Refutation
        • R(f);CHECK,XP(H)
    • Try
      • Q(E);P_PINR(f),XR(h)
      • Vars
        • B(j);S_CUTP(i),XP(K)::QAB1(E),XR(f)
        • B(j);S_CUTP(i)::QAB1(E),XR(f)
        • P(i);N_GUARD::QAB1(E),XR(f)
      • Refutation
        • S(a);
    • Try
      • P(D);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • B(j);P_SPINP(i),XS(I)::R(G)+P(D)
        • P(g);OGATE,P_SPINP(g),XP(D)::R(G),XP(g)
        • P(i);N_GUARD,P_PINS(I),P_SPINB(j),XP(H)::QAB1(E),XR(f)
      • Refutation
        • R(f);XP(H)
  • Actual
    • S(I);XP(e)
    • Threat
      • R(G)+S(I)
    • Vars
      • P(i);CHECK,P_SPINB(j),P_SPINP(i),XP(H)::R(G)+S(I)
      • R(f);OGATEB,P_SPINR(f),XP(H)::QAB(E),XR(h)
      • B(j);P_SPINP(i),XR(G)::QAB1(E),XR(f)
      • P(g);OGATE,P_SPINP(g),XS(I)::R(G),XP(g)
      • B(j);P_SPINP(i)::QAB1(E),XR(f)
HTML5 logo

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).