MESON Chess Problem Database

Problem Display
PID: 138870 (3QBb1q/1N1Pn1PR/4k1p1/4P1R1/Kp1rP2B/1n6/5p2/8 w - - 0 1)

Bakcsi, Gyorgy

4th Comm., BCF 119. Ty., 1968-1969

3QBb1q/1N1Pn1PR/4k1p1/4P1R1/Kp1rP2B/1n6/5p2/8

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxh7
      • 2.gxf8S#
    • 1...Rxd7
      • 2.Qxd7#
    • 1...Sa1
      • 2.Sc5#
    • 1...Sc1
      • 2.Sc5#
    • 1...Sd2
      • 2.Sc5#
    • 1...Sa5
      • 2.Sc5#
    • 1...Sc5+
      • 2.Sxc5#
    • 1...Sf5
      • 2.Qf6#
    • 1...Sc6
      • 2.Qf6#
    • 1...Sc8
      • 2.Qf6#
    • 1...Sg8
      • 2.gxf8S#
  • Tries
    • 1.Rxg6+?
      • 1...Sxg6
        • 2.Qf6#
      • 1...Kxe5!
    • 1.Qb6+?
      • 1...Rd6
        • 2.Sd8#
        • 2.Qxd6#
        • 2.d8S#
      • 1...Sc6!
    • 1.Qxe7+?
      • 1...Kxe7
        • 2.Rxg6#
      • 1...Bxe7!
    • 1.g8Q+?
      • 1...Sxg8
        • 2.Bf7#
      • 1...Qxg8!
    • 1.g8B+?
      • 1...Sxg8
        • 2.Bf7#
      • 1...Qxg8!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Sd8#
      • 1...Sc5+
        • 2.Sxc5#
      • 1...Rxe4
        • 2.Qd6#
      • 1...Rxd7
        • 2.Qxd7#
      • 1...Sd5
        • 2.d8S#
      • 1...Sf5
        • 2.Rxg6#
      • 1...Sc6
        • 2.Rxg6#
      • 1...Sc8
        • 2.Rxg6#
      • 1...Sg8
        • 2.gxf8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(i);N_GUARD,XR(I)::PXB(h)=S
    • R(d);OGATE,XP(G)::QAB1(J),XR(d)
    • S(b);N_GUARD::S(F)
    • S(b);CHECK,N_GUARD::S(F),XS(b)
    • S(g);OGATE::QAR1(J)
    • S(g);S_CUTQ(i)::PXB(h)=S
  • Tries
    • Try
      • R(E);CHECK,XP(f)
      • Vars
        • S(g);OGATE,XR(E)::QAR1(J)
      • Refutation
        • K(e);P-FLIGHT,XP(D)
    • Try
      • Q(J);CHECK
      • Refutation
        • S(g);P_SPINS(g)
    • Try
      • Q(J);CHECK,XS(g)
      • Vars
        • K(e);P-FLIGHT,XQ(J)::B(C)+R(E),XP(f)
      • Refutation
        • B(h);XQ(J)
    • Try
      • P(H);CHECK
      • Vars
        • S(g);XQ(H)::B(K)
      • Refutation
        • Q(i);XQ(H)
    • Try
      • P(H);CHECK
      • Vars
        • S(g);XB(H)::B(K)
      • Refutation
        • Q(i);XB(H)
  • Actual
    • Q(J);
    • Threat
      • S(F)
    • Vars
      • S(b);CHECK,N_GUARD::S(F),XS(b)
      • R(d);N_GUARD,XP(B)::QAR1(J)
      • R(d);OGATE,XP(G)::QAB1(J),XR(d)
      • S(g);S_CUTR(d)::P=S
      • S(g);N_GUARD::R(E),XP(f)
      • S(g);S_CUTQ(i)::PXB(h)=S
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