MESON Chess Problem Database

Problem Display
PID: 270911 (6bb/4N2p/q1r4n/2n4Q/R2rkp2/2P4R/4B1N1/5K2 w - - 0 1)

Stevenson, Edward

The Observer, 1959

(First published on Sun Nov 22 1959)

6bb/4N2p/q1r4n/2n4Q/R2rkp2/2P4R/4B1N1/5K2

#2

8 + 10

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe2+
      • 2.Qxe2#
    • 1...Re6
      • 2.Qd5#
    • 1...Rf6
      • 2.Rxd4#
    • 1...Bd5
      • 2.Qxd5#
    • 1...Be5
      • 2.Qf3#
    • 1...Sd3
      • 2.Bf3#
    • 1...Se6
      • 2.Qd5#
    • 1...Sg4
      • 2.Qf5#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sf7
      • 2.Qd5#
      • 2.Qf5#
  • Tries
    • 1.Bd3+?
      • 1...Sxd3
        • 2.Qe2#
      • 1...Qxd3+!
  • Keys
    • 1.Rh4!
      • threat
        • 2.Rxf4#
      • 1...Qxe2+
        • 2.Qxe2#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Rf6
        • 2.Rxd4#
      • 1...Be5
        • 2.Qf3#
      • 1...Sd3
        • 2.Bf3#
      • 1...Se6
        • 2.Qd5#
      • 1...Sg4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • Q(e);CHECK,OGATE,XB(B)::QAR2(G),XQ(e)
    • R(f);S_CUTB(i)::QAB1(G)
    • R(f);S_CUTB(j)::R1(F),XR(a)
    • B(i);N_GUARD::QAB1(G),XB(i)
    • B(j);SBLOCK::QAB1(G)
    • S(d);N_PINB(B),SBLOCK::B(B)
    • S(d);S_CUTB(i)::QAB1(G)
    • S(g);N_GUARD::QAB1(G)
    • S(g);N_GUARD::QAB1(G),XS(g)
  • Tries
    • Try
      • B(B);CHECK
      • Vars
        • S(d);XB(B)::QAR2(G)
      • Refutation
        • Q(e);CHECK,XB(B)
  • Actual
    • R(E);P_PINP(c)
    • Threat
      • R1(E),XP(c)
    • Vars
      • Q(e);CHECK,OGATE,XB(B)::QAR2(G),XQ(e)
      • S(g);N_GUARD::QAB1(G),XS(g)
      • R(f);S_CUTB(j)::R1(F),XR(a)
      • B(j);SBLOCK::QAB1(G)
      • S(d);N_PINB(B),SBLOCK::B(B)
      • S(d);S_CUTB(i)::QAB1(G)
      • S(g);N_GUARD,N_SPINP(c)::QAB1(G)
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