MESON Chess Problem Database

Problem Display
PID: 28359 (8/8/6R1/pNp5/kpp1NR1p/7Q/8/1K6 w - - 0 1)

Marks, Udo

Murkisch, Godehard

stern, 1994

8/8/6R1/pNp5/kpp1NR1p/7Q/8/1K6

#2

6 + 6

6114 Problemschach-Jahrbuch (1994) 1995
3242 BCPS Rapid Solving (Cheltenham) 2001

SOLUTION

  • SOUND
  • Sets
    • 1...Kxb5
      • 2.Qd7#
  • Tries
    • 1.Ka2?
      • 1...Kxb5
        • 2.Qd7#
      • 1...c3
        • 2.Sexc3#
      • 1...b3+!
    • 1.Kb2?
      • 1...c3+
        • 2.Sexc3#
      • 1...Kxb5
        • 2.Qd7#
      • 1...b3!
    • 1.Kc2?
      • 1...Kxb5
        • 2.Qd7#
      • 1...c3
        • 2.Sexc3#
      • 1...b3+!
    • 1.Sd2?
      • 1...Kxb5
        • 2.Qd7#
      • 1...b3
        • 2.Qxb3#
      • 1...c3!
    • 1.Sed6?
      • 1...b3
        • 2.Rxc4#
      • 1...c3!
    • 1.Qe6?
      • 1...Kb3
        • 2.Sxc5#
      • 1...Kxb5
        • 2.Qd7#
        • 2.Qc6#
        • 2.Qe8#
      • 1...c3
        • 2.Sexc3#
      • 1...b3
        • 2.Qxc4#
      • 1...h3!
    • 1.Qd7?
      • threat
        • 2.Sxc5#
      • 1...Kb3
        • 2.Sxc5#
        • 2.Qd1#
      • 1...b3!
  • Keys
    • 1.Qb3+!
      • 1...Kxb3
        • 2.Sxc5#
      • 1...Kxb5
        • 2.Sc3#
      • 1...cxb3
        • 2.Sec3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);OGATEB,S_FLIGHT,XS(E)::QAB(B)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(E)::QAB(B)
        • P(c);S_CUTP(b)::S(C),XP(c)
      • Refutation
        • P(b);CHECK
    • Try
      • K(A);P-FLIGHT
      • Vars
        • P(c);CHECK,S_CUTP(b)::S(C),XP(c)
        • K(a);OGATEB,S_FLIGHT,XS(E)::QAB(B)
      • Refutation
        • P(b);
    • Try
      • K(A);S_FLIGHT
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(E)::QAB(B)
        • P(c);S_CUTP(b)::S(C),XP(c)
      • Refutation
        • P(b);CHECK
    • Try
      • S(C);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(E)::QAB(B)
        • P(b);P_SPINP(c)::QAB1(B),XP(b)
      • Refutation
        • P(c);P_SPINP(b)
    • Try
      • S(C);
      • Vars
        • P(b);OGATEB,P_SPINP(c)::R(D),XP(c)
      • Refutation
        • P(c);P_SPINP(b)
    • Try
      • Q(B);
      • Vars
        • K(a);P_SPINP(c),S_FLIGHT::S(C),XP(f)
        • P(c);S_CUTP(b)::S(C),XP(c)
        • P(b);OGATEB::QAR2(B),XP(c)
      • Refutation
        • P(d);
    • Try
      • Q(B);
      • Threat
        • S(C),XP(f)
      • Refutation
        • P(b);
  • Actual
    • Q(B);CHECK
    • Vars
      • K(a);S_FLIGHT,XQ(B)::S(C),XP(f)
      • K(a);P_SPINP(b),S_FLIGHT,XS(E)::S(C)
      • P(c);SBLOCK,XQ(B)::S(C)
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