MESON Chess Problem Database

Problem Display
PID: 142003 (8/8/1Qp2Kp1/3k4/3N4/1R6/8/8 w - - 0 1)

Overath, Lothar

Deutsche Schachzeitung, 1987

8/8/1Qp2Kp1/3k4/3N4/1R6/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qxc6#
  • Tries
    • 1.Se2?
      • threat
        • 2.Qd4#
      • 1...Ke4
        • 2.Qd4#
        • 2.Qxc6#
      • 1...Kd6
        • 2.Rd3#
      • 1...c5
        • 2.Qe6#
      • 1...Kc4!
    • 1.Sf3?
      • threat
        • 2.Qd4#
      • 1...Ke4
        • 2.Qd4#
      • 1...Kd6
        • 2.Rd3#
      • 1...c5
        • 2.Qe6#
      • 1...Kc4!
    • 1.Sf5?
      • threat
        • 2.Qd4#
      • 1...Kc4
        • 2.Se3#
      • 1...Ke4
        • 2.Qd4#
      • 1...c5
        • 2.Qe6#
      • 1...gxf5!
    • 1.Sxc6?
      • 1...Kc4
        • 2.Qb5#
      • 1...Ke4
        • 2.Qd4#
      • 1...Kd6
        • 2.Rd3#
      • 1...g5!
    • 1.Rb4?
      • threat
        • 2.Qxc6#
      • 1...Kd6
        • 2.Qxc6#
      • 1...c5
        • 2.Qc6#
        • 2.Qe6#
      • 1...Ke4!
    • 1.Qc5+?
      • 1...Ke4
        • 2.Qe5#
      • 1...Kxc5!
  • Keys
    • 1.Sc2!
      • threat
        • 2.Qd4#
      • 1...Kc4
        • 2.Se3#
      • 1...Ke4
        • 2.Qd4#
      • 1...Kd6
        • 2.Rd3#
      • 1...c5
        • 2.Qe6#

This is after 18502

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT,P_SPINP(b)::QAR1(C),XP(b)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);P-FLIGHT,P_SPINP(b)::R(A)
        • P(b);OGATE,SBLOCK::QAB1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(B);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);S_FLIGHT::QAR1(C)
        • K(a);P-FLIGHT,P_SPINP(b)::R(A)
        • P(b);OGATE,SBLOCK::QAB1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(B);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);S_FLIGHT::S(B)
        • K(a);S_FLIGHT::QAR1(C)
        • P(b);OGATE,SBLOCK::QAB1(C)
      • Refutation
        • P(c);XS(B)
    • Try
      • S(B);XP(b)
      • Vars
        • K(a);S_FLIGHT::QAB1(C)
        • K(a);S_FLIGHT::QAR1(C)
        • K(a);P-FLIGHT::R(A)
      • Refutation
        • P(c);
    • Try
      • R(A);
      • Threat
        • QAB1(C),XP(b)
      • Vars
        • K(a);P-FLIGHT,P_SPINP(b)::QAR1(C),XP(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT,XQ(C)
  • Actual
    • S(B);
    • Threat
      • QAR1(C)
    • Vars
      • K(a);S_FLIGHT::S(B)
      • K(a);S_FLIGHT::QAR1(C)
      • K(a);P-FLIGHT,P_SPINP(b)::R(A)
      • P(b);OGATE,SBLOCK::QAB1(C)
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