MESON Chess Problem Database

Problem Display
PID: 102505 (8/8/8/8/8/5K2/1p1p3k/1RnQ4 w - - 0 1)

Schonberger, Tibor

L'Echiquier Marseillais, 1925

8/8/8/8/8/5K2/1p1p3k/1RnQ4

#2

3 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kh3
      • 2.Qh1#
    • 1...Sa2
      • 2.Qh1#
    • 1...Se2
      • 2.Qh1#
    • 1...Sb3
      • 2.Qh1#
    • 1...Sd3
      • 2.Qh1#
  • Tries
    • 1.Kf2?
      • threat
        • 2.Qh5#
      • 1...Kh3
        • 2.Qh5#
      • 1...Se2
        • 2.Qh1#
      • 1...Sd3+!
    • 1.Kg4?
      • 1...Sa2
        • 2.Qe2#
        • 2.Qg1#
        • 2.Qh1#
        • 2.Qxd2#
      • 1...Se2
        • 2.Qxe2#
        • 2.Qh1#
      • 1...Sb3
        • 2.Qe2#
        • 2.Qg1#
        • 2.Qh1#
      • 1...Sd3
        • 2.Qg1#
        • 2.Qh1#
      • 1...Kg2!
    • 1.Qg1+?
      • 1...Kh3
        • 2.Qh1#
        • 2.Qg3#
      • 1...Kxg1!
  • Keys
    • 1.Qxd2+!
      • 1...Kg1
        • 2.Qg2#
      • 1...Kh1
        • 2.Qg2#
      • 1...Kh3
        • 2.Qh6#
      • 1...Se2
        • 2.Qh6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • K(d);P-FLIGHT::QAR2(B)
    • S(a);SBLOCK::QAR1(B)
    • S(a);::QAR1(B)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Threat
        • QAR(B)
      • Vars
        • K(d);P-FLIGHT::QAR2(B)
        • S(a);::QAR1(B)
      • Refutation
        • S(a);CHECK
    • Try
      • K(C);S_FLIGHT
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • K(d);P_SPINS(a),S_FLIGHT,XQ(B)
  • Actual
    • Q(B);CHECK,XP(c)
    • Vars
      • K(d);P_SPINS(a),S_FLIGHT::QAR1(B)
      • K(d);P-FLIGHT,P_SPINS(a)::QAB1(B)
      • K(d);P-FLIGHT::QAR(B)
      • S(a);P_SPINS(a)::QAR(B)
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