MESON Chess Problem Database

Problem Display
PID: 218 (N3b2K/1nQ1B1Rp/7r/1p1k4/3NR3/1p2bP2/3r1p2/5q2 w - - 0 1)

Macleod, Norman Alasdair

4th HM., Parallele 50, 1950

N3b2K/1nQ1B1Rp/7r/1p1k4/3NR3/1p2bP2/3r1p2/5q2

#2

8 + 11

3174 The Two-move Chess Problem Tradition and Development 1966
6455 The Chessboard Adventures of Norman Macleod 1996
3335 Cyclone 2000
5454 Near Snap 2007
145 StrateGems 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Qe5#
    • 1...Rxd4
      • 2.Re5#
    • 1...Rh1
      • 2.Sb6#
    • 1...Rh2
      • 2.Sb6#
    • 1...Rh3
      • 2.Sb6#
    • 1...Rh4
      • 2.Sb6#
    • 1...Rh5
      • 2.Sb6#
    • 1...Rb6
      • 2.Sxb6#
    • 1...Bg5
      • 2.Rxg5#
    • 1...Bc6
      • 2.Sb6#
    • 1...Bg6
      • 2.Sb6#
      • 2.Qc6#
    • 1...Sa5
      • 2.Qc5#
    • 1...Sc5
      • 2.Qxc5#
    • 1...Sd6
      • 2.Sb6#
    • 1...Sd8
      • 2.Qc5#
  • Tries
    • 1.Qc6+?
      • 1...Bxc6
        • 2.Sb6#
      • 1...Rxc6!
    • 1.Qxb7+?
      • 1...Rc6
        • 2.Sb6#
      • 1...Bc6
        • 2.Sb6#
      • 1...Kc4!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Sb4#
      • 1...Rxc6
        • 2.Qe5#
      • 1...Bxc6
        • 2.Qe5#
      • 1...Rd4
        • 2.Sb6#
      • 1...Qc4
        • 2.Re5#
      • 1...Bc5
        • 2.Rg5#
      • 1...b4
        • 2.Sxb4#

This anticipates 8181(1995)

There are these versions: 30033

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 11
  • Sets
    • Q(a);SBLOCK::QAR1(D)
    • R(b);SBLOCK,XS(B)::R1(C)
    • R(h);N_GUARD::S(G)
    • R(h);N_GUARD::S(G),XR(h)
    • B(e);N_GUARD::R(F),XB(e)
    • B(k);S_CUTR(h)::S(G)
    • S(i);N_GUARD::QAR1(D)
    • S(i);N_GUARD::QAR1(D),XS(i)
    • S(i);S_CUTR(h)::S(G)
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • B(k);XQ(D)::S(G)
      • Refutation
        • R(h);XQ(D)
    • Try
      • Q(D);CHECK,XS(i)
      • Vars
        • R(h);P_SPINR(h)::S(G)
        • B(k);P_SPINB(k)::S(G)
      • Refutation
        • K(g);S_FLIGHT
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • R(h);SBLOCK,XS(B)::QAR1(D)
      • B(k);SBLOCK,XS(B)::QAR1(D)
      • R(b);S_CUTB(e)::S(G)
      • Q(a);SBLOCK::R1(C)
      • B(e);N_GUARD::R(F)
      • P(f);::S(B),XP(f)
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