MESON Chess Problem Database

Problem Display
PID: 211092 (8/2Q5/5p2/Rb1P1P2/3Nk3/3r1N1K/2P2PB1/3R4 w - - 0 1)

Shaw, EH

The Observer, 1921

(First published on Sun Jul 24 1921)

8/2Q5/5p2/Rb1P1P2/3Nk3/3r1N1K/2P2PB1/3R4

#2

11 + 4

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd5
      • 2.Qc6#
    • 1...Rxf3+
      • 2.Bxf3#
    • 1...Rxd4
      • 2.Sxd4#
      • 2.Sh4#
    • 1...Ba4
      • 2.cxd3#
    • 1...Bc6
      • 2.cxd3#
    • 1...Bd7
      • 2.cxd3#
    • 1...Be8
      • 2.cxd3#
  • Tries
    • 1.Re1+?
      • 1...Kxd5
        • 2.Rxb5#
        • 2.Qc6#
        • 2.c4#
      • 1...Re3!
    • 1.Rxd3?
      • threat
        • 2.Se1#
        • 2.Sg1#
        • 2.Sd2#
        • 2.Sh2#
        • 2.Sh4#
        • 2.Sg5#
      • 1...Kxd5
        • 2.Se1#
        • 2.Sg1#
        • 2.Sd2#
        • 2.Sh2#
        • 2.Sh4#
        • 2.Se5#
        • 2.Sg5#
        • 2.Qc6#
      • 1...Bxd3!
    • 1.cxd3+?
      • 1...Kxd5
        • 2.Rxb5#
        • 2.Qc6#
      • 1...Bxd3!
  • Keys
    • 1.Se2!
      • 1...Rxf3+
        • 2.Sg3#
      • 1...Kxd5
        • 2.Sc3#
      • 1...Kxf5
        • 2.Qh7#
      • 1...Rxd1
        • 2.Sfd4#
        • 2.Sh4#
      • 1...Rxd5
        • 2.Sg3#
        • 2.Sfd4#
        • 2.Sh4#
        • 2.Qf4#
      • 1...Rd2
        • 2.Sfd4#
        • 2.Sh4#
      • 1...Ra3
        • 2.Sg3#
        • 2.Qf4#
      • 1...Rb3
        • 2.Sg3#
        • 2.Qf4#
      • 1...Rc3
        • 2.Sg3#
        • 2.Qf4#
      • 1...Re3
        • 2.Sg3#
        • 2.Qf4#
      • 1...Rd4
        • 2.Sfxd4#
        • 2.Sh4#
      • 1...Ba4
        • 2.Sg3#
        • 2.Qf4#
      • 1...Bc4
        • 2.Sg3#
        • 2.Qf4#
      • 1...Ba6
        • 2.Sg3#
        • 2.Qf4#
      • 1...Bc6
        • 2.Sg3#
        • 2.Qf4#
      • 1...Bd7
        • 2.Sg3#
        • 2.Qf4#
      • 1...Be8
        • 2.Sg3#
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • K(b);OGATEB,P_SPINB(c),S_FLIGHT,XP(I)::QAB1(K)
    • R(a);CHECK,OGATE,P_SPINR(a),XS(E)::B(D),XR(a)
    • B(c);N_GUARD::P(B),XR(a)
    • B(c);N_GUARD,P_PINP(J)::P(B),XR(a)
  • Tries
    • Try
      • R(A);CHECK
      • Refutation
        • R(a);P_SPINR(a)
    • Try
      • R(A);N_SPINS(E),XR(a)
      • Threat
        • DUALS(6)
      • Refutation
        • B(c);XR(A)
    • Try
      • P(B);CHECK,N_SPINS(E),XR(a)
      • Refutation
        • B(c);XP(B)
  • Actual
    • S(G);
    • Vars
      • R(a);CHECK,P_SPINR(a),XS(E)::S(G)
      • K(b);P_SPINB(c),P_SPINR(a),S_FLIGHT,XP(I)::S(G)
      • K(b);OGATEB,S_FLIGHT,XP(J)::QAB(K)
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