MESON Chess Problem Database

Problem Display
PID: 122238 (K7/8/5B2/3kPQn1/3r4/3R4/4P1b1/2R5 w - - 0 1)

Scheel, Johan

Goteborg Chess Club JT, 1920

K7/8/5B2/3kPQn1/3r4/3R4/4P1b1/2R5

#2

7 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Qd7#
    • 1...Sf3
      • 2.e4#
  • Tries
    • 1.Qc8?
      • threat
        • 2.Qc6#
      • 1...Rxd3
        • 2.Qc4#
      • 1...Ke4!
    • 1.e4+?
      • 1...Bxe4
        • 2.Qd7#
      • 1...Sxe4!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Rxd4#
      • 1...Rxd3
        • 2.Qc4#
      • 1...Be4
        • 2.Qd7#
      • 1...Sf3
        • 2.e4#
      • 1...Se4
        • 2.Qg8#
      • 1...Se6
        • 2.Qxg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(a);SBLOCK::QAR2(E)
    • S(d);N_GUARD,S_CUTB(a)::P(B)
  • Tries
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • R(b);N_SPINR(b),XR(C)::QAB1(E)
      • Refutation
        • K(c);N_SPINR(b),S_FLIGHT
    • Try
      • P(B);CHECK
      • Vars
        • B(a);SBLOCK,XP(B)::QAR2(E)
      • Refutation
        • S(d);XP(B)
  • Actual
    • Q(E);
    • Threat
      • R1(C),XR(b)
    • Vars
      • R(b);N_SPINR(b),OGATE,XR(C)::QAB1(E)
      • B(a);SBLOCK::QAR2(E)
      • S(d);N_GUARD,S_CUTB(a)::P(B)
      • S(d);OGATE,SBLOCK::QAB(E)
      • S(d);N_GUARD,SBLOCK::QAB(E),XB(a)
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