MESON Chess Problem Database

Problem Display
PID: 210126 (1br2N2/p1kP1P2/rn3Rp1/1Q1n2B1/5p2/p7/6bq/2KR4 w - - 0 1)

Renker, Gerhard

Deutsche Schachblatter, 1940

1br2N2/p1kP1P2/rn3Rp1/1Q1n2B1/5p2/p7/6bq/2KR4

#2

8 + 12

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rd8
      • 2.Qc6#
    • 1...Sxd7
      • 2.Qxd7#
  • Tries
    • 1.dxc8Q+?
      • 1...Sxc8
        • 2.Qd7#
      • 1...Kxc8!
    • 1.dxc8R+?
      • 1...Kb7
        • 2.Qc6#
      • 1...Sxc8
        • 2.Qd7#
      • 1...Kxc8!
    • 1.d8Q+?
      • 1...Kxd8+
        • 2.Rc6#
      • 1...Rxd8
        • 2.Qc6#
      • 1...Kb7+!
    • 1.d8B+?
      • 1...Kxd8+
        • 2.Rc6#
      • 1...Rxd8
        • 2.Qc6#
      • 1...Kb7+!
  • Keys
    • 1.d8S!
      • threat
        • 2.Rc6#
      • 1...Kxd8+
        • 2.Rc6#
      • 1...Rxd8
        • 2.Qc6#
      • 1...Sxf6
        • 2.Sfe6#
        • 2.Qe5#
      • 1...Sc3
        • 2.Sfe6#
        • 2.Qe5#
      • 1...Se3
        • 2.Sfe6#
        • 2.Qe5#
      • 1...Sb4
        • 2.Sfe6#
        • 2.Qe5#
      • 1...Se7
        • 2.Sfe6#
        • 2.Qe5#
      • 1...Sa4
        • 2.Qd7#
      • 1...Sc4
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Sa8
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(l);SBLOCK::QAR1(C)
    • S(g);OGATE,XP(F)::QAR1(C),XS(g)
  • Tries
    • Try
      • P(F);CHECK,XR(l)
      • Vars
        • S(g);XQ(F)::QAR1(C)
      • Refutation
        • K(j);P-FLIGHT,XQ(F)
    • Try
      • P(F);CHECK,XR(l)
      • Vars
        • K(j);P-FLIGHT,P_SPINS(g)::QAB1(C)
        • S(g);XR(F)::QAR1(C)
      • Refutation
        • K(j);P-FLIGHT,XR(F)
    • Try
      • P(F);CHECK
      • Vars
        • K(j);CHECK,P_SPINS(e),S_FLIGHT,XQ(F)::B(D)+R(E)
        • R(l);SBLOCK,XQ(F)::QAR1(C)
      • Refutation
        • K(j);CHECK,P-FLIGHT,P_SPINS(g)
    • Try
      • P(F);CHECK
      • Vars
        • K(j);CHECK,P_SPINS(e),S_FLIGHT,XB(F)::B(D)+R(E)
        • R(l);SBLOCK,XB(F)::QAR1(C)
      • Refutation
        • K(j);CHECK,P-FLIGHT,P_SPINS(g)
  • Actual
    • P(F);
    • Threat
      • R1(E)
    • Vars
      • K(j);CHECK,P_SPINS(e),S_FLIGHT,XS(F)::B(D)+R(E)
      • R(l);SBLOCK,XS(F)::QAR1(C)
      • S(g);N_GUARD::QAR1(C)
      • S(g);N_GUARD::QAR1(C),XS(g)
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