MESON Chess Problem Database

Problem Display
PID: 141209 (8/3R4/Kp2q2p/3Np2Q/pRN1kp2/r2b4/pPB3P1/5nB1 w - - 0 1)

Anderson, Martin (England)

The Observer, 1951

(First published on Sun Jul 29 1951)

8/3R4/Kp2q2p/3Np2Q/pRN1kp2/r2b4/pPB3P1/5nB1

#2

10 + 11

14867 BCPS Library 2011
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qh3
      • 2.Sf6#
      • 2.Qxe5#
    • 1...Qg4
      • 2.Sf6#
      • 2.Qxe5#
    • 1...Qxd5
      • 2.Qg6#
    • 1...Qf5
      • 2.Qf3#
    • 1...Qxd7
      • 2.Sf6#
      • 2.Qxe5#
    • 1...Qf7
      • 2.Qxe5#
    • 1...Qg8
      • 2.Sf6#
      • 2.Qxe5#
    • 1...Qc6
      • 2.Qxe5#
    • 1...Qf6
      • 2.Sxf6#
    • 1...Qg6
      • 2.Qxg6#
      • 2.Qxe5#
    • 1...Qe7
      • 2.Qg6#
    • 1...Qe8
      • 2.Sf6#
    • 1...Rc3
      • 2.Sxc3#
    • 1...Bxc2
      • 2.Sxe5#
    • 1...f3
      • 2.Qxf3#
      • 2.gxf3#
    • 1...b5+
      • 2.Scb6#
  • Tries
    • 1.Bxd3+?
      • 1...Rxd3
        • 2.Sd2#
      • 1...Kxd3!
    • 1.Qg6+?
      • 1...Qf5
        • 2.Sf6#
      • 1...Qxg6!
  • Keys
    • 1.Se7!
      • threat
        • 2.Qf3#
      • 1...Qxc4+
        • 2.Rxc4#
      • 1...b5+
        • 2.Sd6#
      • 1...Qxe7
        • 2.Qg6#
      • 1...Bxc2
        • 2.Sd2#
      • 1...f3
        • 2.Qxf3#
      • 1...Qh3
        • 2.Qxe5#
      • 1...Qg4
        • 2.Qxe5#
      • 1...Sd2
        • 2.Qe2#
      • 1...Sh2
        • 2.Qe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 7
  • Sets
    • Q(j);N_GUARD,XS(G)::QAB(H)
    • Q(j);SBLOCK::QAB1(H)
    • Q(j);N_GUARD::QAR1(H),XP(h)
    • Q(j);N_GUARD::S(G),XQ(j)
    • Q(j);N_GUARD::QAB(H)
    • Q(j);N_GUARD::S(G)
    • R(c);N_GUARD::S(G),XR(c)
    • B(d);N_PINS(F),N_SPINB(d),XB(C)::R(E)+S(F),XP(h)
    • P(i);CHECK,N_PINS(F)::R(E)+S(F)
  • Tries
    • Try
      • B(C);CHECK,N_SPINS(F),XB(d)
      • Vars
        • R(c);SBLOCK,XB(C)::R(E)+S(F),DCHECK
      • Refutation
        • K(f);S_FLIGHT,XB(C)
    • Try
      • Q(H);CHECK
      • Vars
        • Q(j);P_SPINQ(j)::S(G)
      • Refutation
        • Q(j);XQ(H)
  • Actual
    • S(G);
    • Threat
      • QAB1(H)
    • Vars
      • Q(j);CHECK,OGATE,P_SPINQ(j),XS(F)::R(E),XQ(j)
      • P(i);CHECK,N_PINS(F)::R(E)+S(F),DCHECK
      • Q(j);N_GUARD,XS(G)::QAB(H)
      • B(d);N_PINS(F),N_SPINB(d),XB(C)::R(E)+S(F),DCHECK
      • P(g);::QAB1(H),XP(g)
      • Q(j);N_GUARD::QAR1(H),XP(h)
      • S(a);N_GUARD::QAR2(H)
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