MESON Chess Problem Database

Problem Display
PID: 120719 (8/1R4q1/2p5/k1p3n1/7Q/1R5r/7p/4n2K w - - 0 1)

Scheel, Johan

Szachista Polski, 1913

8/1R4q1/2p5/k1p3n1/7Q/1R5r/7p/4n2K

#2

4 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ka6
      • 2.Qa4#
    • 1...Qa1
      • 2.Ra7#
    • 1...Qb2
      • 2.Ra7#
    • 1...Qc3
      • 2.Ra7#
    • 1...Qd4
      • 2.Ra7#
    • 1...Qe5
      • 2.Ra7#
    • 1...Qf6
      • 2.Ra7#
    • 1...Qh6
      • 2.Ra7#
    • 1...Qf8
      • 2.Ra7#
    • 1...Qh8
      • 2.Ra7#
    • 1...Qg6
      • 2.Ra7#
    • 1...Qg8
      • 2.Ra7#
    • 1...Sd3
      • 2.Ra3#
    • 1...Sef3
      • 2.Ra3#
    • 1...Sgf3
      • 2.Ra3#
    • 1...Sf7
      • 2.Ra7#
  • Tries
    • 1.R3b5+?
      • 1...Ka6
        • 2.Qa4#
      • 1...cxb5!
    • 1.R7b5+?
      • 1...Ka6
        • 2.Qa4#
      • 1...cxb5!
    • 1.Qxe1+?
      • 1...Ka6
        • 2.R3b6#
      • 1...Qc3
        • 2.Ra3#
        • 2.Ra7#
      • 1...Rc3
        • 2.Ra3#
        • 2.Qa1#
      • 1...Ka4!
    • 1.Qb4+?
      • 1...Ka6
        • 2.Qa3#
        • 2.Qa4#
        • 2.Qb6#
      • 1...cxb4!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Qa8#
      • 1...Ka4
        • 2.Qa8#
      • 1...Ka6
        • 2.Qa8#
      • 1...Qxh8
        • 2.Ra7#
      • 1...Qxb7
        • 2.Qa1#
      • 1...Rxh8
        • 2.Ra3#
      • 1...Qf8
        • 2.Ra7#
        • 2.Qa1#
      • 1...Qg8
        • 2.Ra7#
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 14
  • Sets
    • K(d);P-FLIGHT::QAR2(C)
    • Q(h);N_GUARD::R(D)
    • S(a);S_CUTR(c)::R(B)
    • S(f);S_CUTR(c)::R(B)
    • S(f);S_CUTQ(h)::R(D)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR2(C)
      • Refutation
        • P(g);XR(B)
    • Try
      • R(D);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR2(C)
      • Refutation
        • P(g);XR(D)
    • Try
      • Q(C);CHECK,XS(a)
      • Vars
        • K(d);P-FLIGHT::R1(B)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Refutation
        • P(e);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR(C)
    • Vars
      • K(d);P-FLIGHT::QAR(C)
      • K(d);P-FLIGHT::QAR2(C)
      • Q(h);N_GUARD,XQ(C)::R(D)
      • Q(h);OGATE,XR(D)::QAR(C)
      • R(c);N_GUARD,XQ(C)::R(B)
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