MESON Chess Problem Database

Problem Display
PID: 87956 (8/8/1p2N2p/2p1p2P/2QpkpP1/6p1/4K1P1/1n1N4 w - - 0 1)

Eddy, Edwin John

The Problemist, 1933

8/8/1p2N2p/2p1p2P/2QpkpP1/6p1/4K1P1/1n1N4

#2

7 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Sc3#
    • 1...Sa3
      • 2.Sc3#
    • 1...Sc3+
      • 2.Sxc3#
    • 1...f3+
      • 2.gxf3#
    • 1...b5
      • 2.Sxc5#
  • Tries
    • 1.Sc7?
      • threat
        • 2.Qd3#
        • 2.Qd5#
      • 1...Sc3+
        • 2.Sxc3#
      • 1...f3+!
    • 1.Qc2+?
      • 1...d3+
        • 2.Qxd3#
      • 1...Kd5!
  • Keys
    • 1.Sxd4!
      • threat
        • 2.Sc2#
        • 2.Sb3#
        • 2.Sf3#
        • 2.Sb5#
        • 2.Sf5#
        • 2.Sc6#
        • 2.Se6#
      • 1...Sc3+
        • 2.Sxc3#
      • 1...f3+
        • 2.Sxf3#
      • 1...cxd4
        • 2.Qc6#
      • 1...exd4
        • 2.Qe6#
      • 1...Sa3
        • 2.Sc3#
      • 1...Sd2
        • 2.Sc3#
      • 1...b5
        • 2.Sxb5#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::S(A)
    • S(a);CHECK,N_GUARD::S(A),XS(a)
    • P(e);CHECK,OGATE::P(C),XP(e)
    • P(h);N_GUARD::S(G),XP(f)
  • Tries
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);CHECK,N_GUARD::S(A),XS(a)
      • Refutation
        • P(e);CHECK
    • Try
      • Q(D);CHECK,N_PINP(c)
      • Vars
        • P(c);CHECK,P_SPINP(c)::QAB1(D),XP(c)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • S(G);XP(c)
    • Threat
      • DUALS(7)
    • Vars
      • S(a);CHECK,N_GUARD::S(A),XS(a)
      • P(e);CHECK::QAR(D)+S(G),XP(e)
      • P(f);OGATE,P_SPINP(f),SBLOCK,XS(G)::QAB(D)
      • P(g);OGATEB,P_SPINP(g),SBLOCK,XS(G)::QAR2(D)
      • S(a);N_GUARD::S(A)
      • P(h);::QAR(D)+S(G),XP(h)
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