MESON Chess Problem Database

Problem Display
PID: 175168 (2QN1K2/pp2rP2/3k3P/r2pp2R/8/2N1p3/8/1R4B1 w - - 0 1)

Lazard, Frederic

Norwood News, 1902

2QN1K2/pp2rP2/3k3P/r2pp2R/8/2N1p3/8/1R4B1

#2

9 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Sb5#
    • 1...Ra2
      • 2.Sb5#
    • 1...Ra3
      • 2.Sb5#
    • 1...Ra4
      • 2.Sb5#
    • 1...Rb5
      • 2.Sxb5#
    • 1...Ra6
      • 2.Sb5#
    • 1...Re6
      • 2.Sxb7#
    • 1...Rxf7+
      • 2.Sxf7#
    • 1...Re8+
      • 2.fxe8S#
    • 1...a6
      • 2.Rb6#
    • 1...b5
      • 2.Qc6#
    • 1...b6
      • 2.Qc6#
  • Tries
    • 1.Rxb7?
      • threat
        • 2.Qc6#
      • 1...Rxf7+
        • 2.Sxf7#
      • 1...Re8+
        • 2.fxe8S#
      • 1...Rc7
        • 2.Qxc7#
      • 1...Ra6
        • 2.Sb5#
      • 1...Rc5!
  • Keys
    • 1.Rb5!
      • 1...Rxf7+
        • 2.Sxf7#
      • 1...Re8+
        • 2.fxe8S#
      • 1...Rxb5
        • 2.Sxb5#
      • 1...Ra1
        • 2.Rxd5#
      • 1...Ra2
        • 2.Rxd5#
      • 1...Ra3
        • 2.Rxd5#
      • 1...Ra4
        • 2.Rxd5#
      • 1...Ra6
        • 2.Rxd5#
      • 1...Re6
        • 2.Sxb7#
      • 1...Rc7
        • 2.Qe6#
      • 1...Rd7
        • 2.Qc5#
      • 1...e2
        • 2.Bc5#
      • 1...d4
        • 2.Se4#
      • 1...e4
        • 2.Rhxd5#
      • 1...a6
        • 2.Rb6#
      • 1...b6
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 5
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • R(b);N_GUARD::S(C)
    • R(b);N_GUARD::S(C),XR(b)
    • R(h);N_GUARD::S(H),XP(g)
    • R(h);CHECK,XP(F)::S(H),XR(h)
    • R(h);CHECK,OGATE::PXR(h)=S
    • P(f);N_GUARD::R(A)
    • P(g);N_GUARD::QAR1(G)
  • Tries
    • Try
      • R(A);XP(g)
      • Threat
        • QAR1(G)
      • Vars
        • R(h);CHECK,XP(F)::S(H),XR(h)
        • R(h);CHECK,OGATE::PXR(h)=S
        • R(h);N_GUARD::QAB1(G),XR(h)
        • R(b);N_GUARD::S(C)
      • Refutation
        • R(b);
  • Actual
    • R(A);
    • Vars
      • R(h);CHECK,XP(F)::S(H),XR(h)
      • R(h);CHECK,OGATE::PXR(h)=S
      • R(b);XR(A)::S(C),XR(b)
      • R(b);N_GUARD::R1(A),XP(c)
      • R(h);N_GUARD::S(H),XP(g)
      • R(h);N_GUARD,SBLOCK::QAR1(G)
      • R(h);SBLOCK::QAB1(G)
      • P(a);OGATE::B(B)
      • P(c);N_GUARD::S(C)
      • P(d);OGATE::R1(D),XP(c)
      • P(f);N_GUARD::R(A)
      • P(g);N_GUARD::QAR1(G)
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