MESON Chess Problem Database

Problem Display
PID: 200005 (8/3p3B/8/2n1N1Rp/bNpkP2R/2pp1Q1K/4r1P1/8 w - - 0 1)

Moreland, P

The Observer, 1947

(First published on Sun Jun 15 1947)

8/3p3B/8/2n1N1Rp/bNpkP2R/2pp1Q1K/4r1P1/8

#2

9 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rf2
      • 2.Qxf2#
    • 1...Rxe4
      • 2.Qf2#
  • Tries
    • 1.Sg4?
      • threat
        • 2.Rd5#
        • 2.Qf6#
      • 1...Rxe4
        • 2.Rd5#
      • 1...Sxe4
        • 2.Rd5#
      • 1...c2
        • 2.Qf6#
      • 1...Rf2
        • 2.Rd5#
        • 2.Qxf2#
        • 2.Qe3#
      • 1...Re3
        • 2.Rd5#
        • 2.Qxe3#
      • 1...Bc6
        • 2.Qf6#
      • 1...d5
        • 2.Rxd5#
        • 2.Qf6#
      • 1...hxg4+!
    • 1.Qf2+?
      • 1...Re3+
        • 2.Sf3#
      • 1...Rxf2!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Sg4#
      • 1...Re3+
        • 2.Sf3#
      • 1...Ke3
        • 2.Sxc4#
      • 1...Rxe4
        • 2.Qf2#
      • 1...Sxe4
        • 2.Qb6#
      • 1...Rf2
        • 2.Qxf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(a);N_GUARD::QAB(B),XR(a)
    • R(a);N_GUARD,P_SPINR(a),XP(E)::QAB(B)
  • Tries
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);XP(E)::R1(H)
        • S(g);XP(E)::R1(H)
        • P(b);::QAB(B)
        • B(d);::QAB(B)
      • Refutation
        • P(h);CHECK,XS(G)
    • Try
      • Q(B);CHECK
      • Vars
        • R(a);CHECK,P_SPINR(a)::S(G)
      • Refutation
        • R(a);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB(B)+S(G)
    • Vars
      • R(a);CHECK,SBLOCK::QAB(B)+S(G),DCHECK
      • K(f);S_FLIGHT::S(G),XP(e)
      • R(a);N_GUARD,P_SPINR(a),XP(E)::QAB(B)
      • S(g);OGATEB,P_SPINS(g),XP(E)::QAB(B)
      • R(a);N_GUARD::QAB(B),XR(a)
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