MESON Chess Problem Database

Problem Display
PID: 144253 (5rr1/1BPN4/1PPppb2/1KNknb1R/2p5/3pP3/4Q1q1/B7 w - - 0 1)

Lubell, Martin S

American Chess Problemist, 1950

5rr1/1BPN4/1PPppb2/1KNknb1R/2p5/3pP3/4Q1q1/B7

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Sxf6#
    • 1...Rb8
      • 2.Sxf6#
    • 1...Rc8
      • 2.Sxf6#
    • 1...Rd8
      • 2.Sxf6#
    • 1...Re8
      • 2.Sxf6#
    • 1...Sf3
      • 2.e4#
    • 1...Sg4
      • 2.Qxg2#
    • 1...Sxc6
      • 2.Bxc6#
    • 1...Sg6
      • 2.Qxg2#
    • 1...Sxd7
      • 2.cxd7#
    • 1...Sf7
      • 2.Sxf6#
  • Tries
    • 1.Qxg2+?
      • 1...Be4
        • 2.Qxe4#
      • 1...Sf3
        • 2.Qxf3#
        • 2.e4#
      • 1...Rxg2!
  • Keys
    • 1.Sa4!
      • threat
        • 2.Sc3#
      • 1...Ke4
        • 2.Sc3#
      • 1...Sxc6
        • 2.Bxc6#
      • 1...Sxd7
        • 2.cxd7#
      • 1...Sf3
        • 2.e4#
      • 1...Sg4
        • 2.Qxg2#
      • 1...Sg6
        • 2.Qxg2#
      • 1...Sf7
        • 2.Sxf6#
      • 1...c3
        • 2.Sxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(j);N_GUARD::S(K),XB(i)
    • S(e);P_SPINB(f),S_CUTQ(a)::P(C)
    • S(e);N_GUARD,P_SPINB(f),S_CUTR(k)::QAB(B),XQ(a)
    • S(e);OGATE,P_SPINB(f),P_SPINS(e),XP(H)::B(I),XS(e)
    • S(e);OGATE,P_SPINB(f),XS(K)::B(I)+P(H),XS(e)
    • S(e);P_SPINB(f),S_CUTR(j)::S(K),XB(i)
  • Tries
    • Try
      • Q(B);CHECK,XQ(a)
      • Vars
        • B(f);N_GUARD,P_SPINB(f),P_SPINS(e)::QAB1(B),XB(f)
      • Refutation
        • R(k);XQ(B)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • K(d);S_FLIGHT::S(E)
      • S(e);OGATE,P_SPINB(f),P_SPINS(e),XP(H)::B(I),XS(e)
      • S(e);OGATE,P_SPINB(f),XS(K)::B(I)+P(H),XS(e)
      • S(e);P_SPINB(f),S_CUTQ(a)::P(C)
      • S(e);N_GUARD,P_SPINB(f),S_CUTR(k)::QAB(B),XQ(a)
      • S(e);P_SPINB(f),S_CUTR(j)::S(K),XB(i)
      • P(c);::S(E),XP(c)
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