MESON Chess Problem Database

Problem Display
PID: 228960 (B7/4ppB1/2p1NrRp/1nNk4/1Kp2QP1/3p1P2/8/8 w - - 0 1)

Lundberg, T

Schackvarlden, 1926

B7/4ppB1/2p1NrRp/1nNk4/1Kp2QP1/3p1P2/8/8

#2

9 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf4
      • 2.Sxf4#
    • 1...Rxg6
      • 2.Qe5#
    • 1...Sa3
      • 2.Sc7#
      • 2.Qd4#
    • 1...Sc3
      • 2.Sc7#
      • 2.Qd4#
    • 1...Sd4
      • 2.Sc7#
      • 2.Qxd4#
    • 1...Sd6
      • 2.Sc7#
      • 2.Qd4#
    • 1...Sa7
      • 2.Sc7#
      • 2.Qd4#
    • 1...Sc7
      • 2.Sxc7#
      • 2.Qd4#
  • Tries
    • 1.Sd7?
      • threat
        • 2.Qe5#
      • 1...Rxf4
        • 2.Sxf4#
      • 1...Rxe6
        • 2.Sb6#
      • 1...Rf5
        • 2.Sb6#
      • 1...Kxe6!
    • 1.Rg5+?
      • 1...Rf5
        • 2.Rxf5#
      • 1...hxg5!
    • 1.Qxf6?
      • threat
        • 2.Sf4#
        • 2.Qe5#
      • 1...Kd6
        • 2.Qe5#
      • 1...fxe6
        • 2.Qe5#
        • 2.Qxe6#
      • 1...exf6!
  • Keys
    • 1.Sb7!
      • threat
        • 2.Qe4#
      • 1...c5+
        • 2.Sbxc5#
      • 1...Kxe6
        • 2.Qf5#
      • 1...Rxf4
        • 2.Sxf4#
      • 1...Rxe6
        • 2.Qxc4#
      • 1...Sc3
        • 2.Sc7#
      • 1...Sd6
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • R(f);XQ(C)::S(F),XR(f)
    • R(f);XR(G)::QAR1(C)
  • Tries
    • Try
      • S(E);
      • Threat
        • QAR1(C)
      • Vars
        • R(f);XQ(C)::S(F),XR(f)
        • R(f);XS(F)::S(E)
        • R(f);::S(E)
      • Refutation
        • K(d);N_SPINP(e),P_SPINR(f),S_FLIGHT,XS(F)
    • Try
      • R(G);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::R(G),XR(f)
      • Refutation
        • P(g);XR(G)
    • Try
      • Q(C);XR(f)
      • Threat
        • DUALS(2)
      • Vars
        • K(d);N_SPINP(e),P-FLIGHT::QAB1(C)
      • Refutation
        • P(h);XQ(C)
  • Actual
    • S(E);N_PINP(e)
    • Threat
      • QAB1(C)
    • Vars
      • P(e);CHECK::B(I)+S(E),XP(e)
      • K(d);P_SPINR(f),S_FLIGHT,XS(F)::QAB1(C)
      • R(f);XQ(C)::S(F),XR(f)
      • R(f);XS(F)::QAB1(C),XP(b)
      • S(c);N_GUARD::S(F)
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