MESON Chess Problem Database

Problem Display
PID: 102285 (6Q1/7K/8/4B3/1nN1k2p/5R1B/4p3/2b1n3 w - - 0 1)

Westberg, CE

Nya Dagligt Allehanda, 1916

6Q1/7K/8/4B3/1nN1k2p/5R1B/4p3/2b1n3

#2

6 + 6

6490 yacpdb 2009
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Bb2
      • 2.Re3#
    • 1...Ba3
      • 2.Re3#
    • 1...Be3
      • 2.Rxe3#
    • 1...Sa2
      • 2.Qa8#
    • 1...Sc2
      • 2.Qa8#
    • 1...Sd3
      • 2.Qa8#
    • 1...Sa6
      • 2.Qa8#
  • Tries
    • 1.Rf4+?
      • 1...Kd3
        • 2.Bf5#
        • 2.Qg6#
      • 1...Bxf4!
    • 1.Qa8+?
      • 1...Sc6
        • 2.Qxc6#
      • 1...Sd5!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Qg6#
      • 1...Kxd3
        • 2.Bf5#
      • 1...Sexd3
        • 2.Qg2#
      • 1...Sbxd3
        • 2.Qa8#
      • 1...Be3
        • 2.Rxe3#

This anticipates 216435(1927)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • B(a);N_GUARD::R1(A)
    • B(a);N_GUARD::R1(A),XB(a)
    • S(d);N_GUARD::QAB(F)
  • Tries
    • Try
      • R(A);CHECK
      • Refutation
        • B(a);XR(A)
    • Try
      • Q(F);CHECK
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::QAB(F),XS(d)
      • Refutation
        • S(d);P_SPINS(d)
  • Actual
    • R(A);
    • Threat
      • QAB(F)
    • Vars
      • K(e);S_FLIGHT,XR(A)::B(B)
      • S(b);N_GUARD,SBLOCK,XR(A)::QAB(F)
      • S(d);N_GUARD,SBLOCK,XR(A)::QAB(F)
      • B(a);N_GUARD::R1(A),XB(a)
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