MESON Chess Problem Database

Problem Display
PID: 196279 (4QB2/3p3K/1Nr2p2/1B1p1RN1/3k1P2/7R/b7/2br4 w - - 0 1)

Swords, WJ

The Observer, 1943

(First published on Sun Feb 21 1943)

4QB2/3p3K/1Nr2p2/1B1p1RN1/3k1P2/7R/b7/2br4

#2

9 + 8

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Rd3#
    • 1...Rf1
      • 2.Rd3#
    • 1...Rg1
      • 2.Rd3#
    • 1...Rd2
      • 2.Qe3#
    • 1...Rd3
      • 2.Rxd3#
    • 1...Rc4
      • 2.Rxd5#
    • 1...Bb2
      • 2.Qe3#
    • 1...Bd2
      • 2.Rd3#
    • 1...Ba3
      • 2.Qe3#
    • 1...Be3
      • 2.Qxe3#
    • 1...Bxf4
      • 2.Rxf4#
    • 1...fxg5
      • 2.Qe5#
  • Keys
    • 1.Qe1!
      • threat
        • 2.Sf3#
      • 1...Rxe1
        • 2.Rd3#
      • 1...fxg5
        • 2.Qe5#
      • 1...Rd6
        • 2.Qc3#
      • 1...d6
        • 2.Se6#
      • 1...Rc3
        • 2.Qxc3#
      • 1...Rd2
        • 2.Qe3#
      • 1...Rd3
        • 2.Rxd3#
      • 1...Rc4
        • 2.Rxd5#
      • 1...Bd2
        • 2.Rd3#
      • 1...Be3
        • 2.Qxe3#
      • 1...Bc4
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • R(b);N_GUARD::R1(A)
    • R(b);S_CUTB(a)::QAB1(H)
    • R(b);N_GUARD::R1(A),XR(b)
    • R(f);S_CUTB(c)::R1(D),XP(e)
    • B(a);N_GUARD::QAB1(H)
    • B(a);S_CUTR(b)::R1(A)
    • B(a);N_GUARD::QAB1(H),XB(a)
    • B(a);OGATE,XP(B)::R(D),XB(a)
    • P(g);N_GUARD,XS(E)::QAB1(H)
  • Actual
    • Q(H);
    • Threat
      • S(E)
    • Vars
      • R(b);N_GUARD,XQ(H)::R1(A)
      • P(g);N_GUARD,XS(E)::QAB1(H)
      • R(f);N_GUARD::QAB1(H)
      • P(h);N_GUARD,S_CUTR(f)::S(E)
      • R(f);N_GUARD::QAB1(H),XR(f)
      • R(b);S_CUTB(a)::QAB1(H)
      • R(b);N_GUARD::R1(A),XR(b)
      • R(f);S_CUTB(c)::R1(D),XP(e)
      • B(a);S_CUTR(b)::R1(A)
      • B(a);N_GUARD::QAB1(H),XB(a)
      • B(c);S_CUTR(f)::QAB1(H)
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