MESON Chess Problem Database

Problem Display
PID: 186942 (4r3/2Q5/3n1p1N/1p2k1N1/3n1p2/b3q3/B3R3/3R3K w - - 0 1)

Stubbs, Arthur Goodwin

The Observer, 1933

(First published on Sun Nov 26 1933)

4r3/2Q5/3n1p1N/1p2k1N1/3n1p2/b3q3/B3R3/3R3K

#2

7 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4+
      • 2.Rxe4#
    • 1...Bc1
      • 2.Qc5#
    • 1...Bb2
      • 2.Qc5#
    • 1...Bc5
      • 2.Qxc5#
    • 1...Sc2
      • 2.Rd5#
    • 1...Sxe2
      • 2.Rd5#
    • 1...Sf3
      • 2.Rd5#
    • 1...Sf5
      • 2.Sg4#
      • 2.Shf7#
      • 2.Rd5#
    • 1...Sc6
      • 2.Rd5#
    • 1...Se6
      • 2.Rd5#
    • 1...b4
      • 2.Qc5#
    • 1...f5
      • 2.Qg7#
  • Tries
    • 1.Rxd4?
      • threat
        • 2.Sf3#
        • 2.Rd5#
      • 1...Qe4+
        • 2.Sf3#
        • 2.Rexe4#
        • 2.Rdxe4#
      • 1...Qxe2
        • 2.Rd5#
      • 1...fxg5
        • 2.Qg7#
      • 1...f5
        • 2.Qg7#
      • 1...f3
        • 2.Sxf3#
      • 1...Kxd4!
    • 1.Qe7+?
      • 1...Se6
        • 2.Rd5#
      • 1...Rxe7!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Qxd4#
      • 1...Qe4+
        • 2.Sf3#
      • 1...Se4
        • 2.Sgf7#
      • 1...Sf5
        • 2.Shf7#
      • 1...Bb2
        • 2.Qc5#
      • 1...Bc5
        • 2.Qxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • Q(b);CHECK,OGATE::R1(D),XQ(b)
    • B(a);N_GUARD::QAR2(G)
    • B(a);N_GUARD::QAR2(G),XB(a)
    • S(c);OGATE::R1(A)
    • S(c);N_SPINQ(b),OGATE,XR(D)::R1(A)
    • P(e);S_CUTB(a)::QAR2(G)
    • P(h);OGATEB::QAB(G)
  • Tries
    • Try
      • R(A);XS(c)
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);N_SPINQ(b),XR(D)::R1(A)
        • P(h);OGATEB,XS(E)::QAB(G)
        • P(h);OGATEB::QAB(G)
        • P(d);::S(E),XP(d)
      • Refutation
        • K(f);N_SPINQ(b),N_SPINS(g),S_FLIGHT,XR(A)
    • Try
      • Q(G);CHECK,N_PINS(g)
      • Vars
        • S(c);OGATE,P_SPINS(c)::R1(A)
      • Refutation
        • R(i);XQ(G)
  • Actual
    • Q(G);N_PINS(g),P_PINS(c)
    • Threat
      • QAB1(G),XS(c)
    • Vars
      • Q(b);CHECK::S(E)
      • S(g);N_GUARD,N_SPINQ(b),SBLOCK::S(E)
      • S(g);N_GUARD,SBLOCK::S(F)
      • B(a);N_GUARD::QAR2(G)
      • B(a);N_GUARD::QAR2(G),XB(a)
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