MESON Chess Problem Database

Problem Display
PID: 53234 (2QR1B2/rpb2p1q/p7/2PBk1P1/p3N2r/2Ppn1P1/KN2b3/4R3 w - - 0 1)

Burger, Robert Eugene

1st Place, Match: USA - Yugoslavia, 1954

2QR1B2/rpb2p1q/p7/2PBk1P1/p3N2r/2Ppn1P1/KN2b3/4R3

#2

12 + 12

268 Chess Life 1955
23 Die Schwalbe 2006

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.Qxc7#
    • 1...Bd1
      • 2.Sxd3#
    • 1...Bf3
      • 2.Sxd3#
    • 1...Bg4
      • 2.Sxd3#
    • 1...Bh5
      • 2.Sxd3#
    • 1...Sd1
      • 2.Sc4#
    • 1...Sf1
      • 2.Sc4#
    • 1...Sc2
      • 2.Sc4#
    • 1...Sg2
      • 2.Sc4#
    • 1...Sc4
      • 2.Sxc4#
    • 1...Sg4
      • 2.Sc4#
    • 1...Sf5
      • 2.Sc4#
    • 1...f5
      • 2.Qe6#
    • 1...f6
      • 2.Qe6#
  • Tries
    • 1.Bg7+?
      • 1...f6
        • 2.Bxf6#
        • 2.Qe6#
      • 1...Qxg7!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Re8#
      • 1...Bxd8
        • 2.Bd6#
      • 1...Sxd5
        • 2.Rxd5#
      • 1...Qf5
        • 2.Qxc7#
      • 1...Bg4
        • 2.Sc4#
      • 1...Bd6
        • 2.Bxd6#
      • 1...Sf5
        • 2.Sxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 11
  • Sets
    • Q(l);SBLOCK::QAB(J),XB(j)
    • B(a);N_GUARD::S(C),XP(b)
    • S(c);N_GUARD::S(C)
    • S(c);N_GUARD::S(C),XS(c)
    • P(k);N_GUARD::QAR1(J)
  • Tries
    • Try
      • B(L);CHECK
      • Refutation
        • Q(l);XB(L)
  • Actual
    • S(F);
    • Threat
      • R(K)
    • Vars
      • B(j);N_GUARD,XR(K)::B(L)
      • S(c);OGATE,P_SPINB(a),XB(H)::R1(K),XS(c)
      • Q(l);SBLOCK::QAB(J),XB(j)
      • B(a);P_SPINS(c),S_CUTR(e)::S(C)
      • B(j);N_GUARD::B(L),XB(j)
      • S(c);P_SPINB(a),S_CUTQ(l)::S(C),XP(b)
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