MESON Chess Problem Database

Problem Display
PID: 100904 (8/8/2p3nR/Rn1k4/8/1K1N1N2/1Q6/8 w - - 0 1)

Donelly, LD

Good Companions, 1921

8/8/2p3nR/Rn1k4/8/1K1N1N2/1Q6/8

#2

6 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sf4
      • 2.Qd4#
      • 2.Qe5#
    • 1...Sh4
      • 2.Qd4#
      • 2.Qe5#
    • 1...Se5
      • 2.Qd4#
      • 2.Qxe5#
    • 1...Se7
      • 2.Qd4#
      • 2.Qe5#
    • 1...Sf8
      • 2.Qd4#
      • 2.Qe5#
    • 1...Sh8
      • 2.Qd4#
      • 2.Qe5#
  • Tries
    • 1.Rxg6?
      • threat
        • 2.Qd4#
        • 2.Qe5#
      • 1...c5
        • 2.Qe5#
      • 1...Ke4!
  • Keys
    • 1.Sc5!
      • 1...Sd4+
        • 2.Qxd4#
      • 1...Kxc5
        • 2.Qd4#
      • 1...Kd6
        • 2.Qe5#
      • 1...Sa3
        • 2.Qd4#
        • 2.Qd2#
      • 1...Sc3
        • 2.Qd2#
      • 1...Sd6
        • 2.Qd4#
        • 2.Qd2#
      • 1...Sa7
        • 2.Qd4#
        • 2.Qd2#
      • 1...Sc7
        • 2.Qd4#
        • 2.Qd2#
      • 1...Sf4
        • 2.Qe5#
      • 1...Sh4
        • 2.Qe5#
      • 1...Se5
        • 2.Qxe5#
      • 1...Se7
        • 2.Qe5#
      • 1...Sf8
        • 2.Qe5#
      • 1...Sh8
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(F);XS(d)
      • Threat
        • DUALS(2)
      • Vars
        • P(c);N_SPINS(a)::QAR1(A)
      • Refutation
        • K(b);N_SPINS(a),S_FLIGHT
  • Actual
    • S(C);N_PINS(a)
    • Vars
      • S(a);CHECK,N_GUARD::QAR1(A),XS(a)
      • K(b);P-FLIGHT,P_SPINS(a),XS(C)::QAB1(A)
      • K(b);P-FLIGHT,P_SPINS(d)::QAB1(A)
      • S(a);N_GUARD::QAR(A)
      • S(d);N_GUARD::QAR1(A)
      • S(d);N_GUARD::QAR1(A),XS(d)
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