MESON Chess Problem Database

Problem Display
PID: 18188 (BBb1R2q/1r1nn2p/N3Q3/1N2b2p/2P1k3/1K3R2/1PP1P3/3r4 w - - 0 1)

Aloni, Yoel

4th Prize=, Volksgazet, 1953

BBb1R2q/1r1nn2p/N3Q3/1N2b2p/2P1k3/1K3R2/1PP1P3/3r4

#2

12 + 10

3841 The Art of Israeli Chess Composition 1983

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3+
      • 2.cxd3#
    • 1...Sc5+
      • 2.Sxc5#
    • 1...Sb6
      • 2.Sc5#
    • 1...Sf6
      • 2.Sc5#
      • 2.Qxe5#
    • 1...Sxb8
      • 2.Sc5#
    • 1...Sf8
      • 2.Sc5#
    • 1...Sd5
      • 2.Qf5#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sc6
      • 2.Qf5#
    • 1...Sg6
      • 2.Qf5#
    • 1...Sg8
      • 2.Qf5#
  • Tries
    • 1.Qg4+?
      • 1...Bf4
        • 2.Qxf4#
      • 1...hxg4!
    • 1.Qxe5+?
      • 1...Sxe5
        • 2.Sc5#
      • 1...Qxe5!
    • 1.Qh6?
      • threat
        • 2.Qe3#
      • 1...Rd3+
        • 2.cxd3#
      • 1...Sc5+
        • 2.Sxc5#
      • 1...Bf4
        • 2.Qxf4#
      • 1...Bd4
        • 2.Qf4#
        • 2.Qc6#
      • 1...Sf5
        • 2.Qf4#
      • 1...Sd5!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Qe3#
      • 1...Rd3+
        • 2.cxd3#
      • 1...Sc5+
        • 2.Sxc5#
      • 1...Sxb6
        • 2.Sc5#
      • 1...Bf4
        • 2.Rxf4#
      • 1...Rd4
        • 2.Sc3#
      • 1...Bd4
        • 2.Qc6#
      • 1...Sd5
        • 2.Sd6#
      • 1...Sf5
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • R(a);CHECK,OGATE::P(B),XR(a)
    • S(f);CHECK,N_GUARD::S(H),XS(f)
    • S(f);N_GUARD,N_PINS(G)::S(H)
    • S(f);N_GUARD,XB(K)::S(H)
    • S(f);N_GUARD::S(H)
    • S(g);N_GUARD,N_SPINR(e)::QAB1(I)
    • S(g);N_GUARD::QAB1(I),XS(g)
    • S(g);N_GUARD::QAB1(I)
  • Tries
    • Try
      • Q(I);CHECK,N_PINB(c)
      • Vars
        • B(c);N_GUARD,P_SPINB(c),P_SPINS(g)::QAR1(I),XB(c)
      • Refutation
        • P(d);XQ(I)
    • Try
      • Q(I);CHECK,XB(c)
      • Vars
        • S(f);XQ(I)::S(H)
      • Refutation
        • Q(j);XQ(I)
    • Try
      • Q(I);N_PINB(c)
      • Threat
        • QAR1(I)
      • Vars
        • R(a);CHECK,OGATE::P(B),XR(a)
        • S(f);CHECK,N_GUARD::S(H),XS(f)
        • B(c);N_GUARD,P_SPINS(g)::QAR1(I),XB(c)
        • S(g);P_SPINB(c)::QAR1(I)
      • Refutation
        • S(g);N_SPINR(e),P_SPINB(c)
  • Actual
    • Q(I);N_PINB(c),N_SPINS(G)
    • Threat
      • QAR1(I)
    • Vars
      • R(a);CHECK,OGATE::P(B),XR(a)
      • S(f);CHECK,N_GUARD::S(H),XS(f)
      • S(f);N_GUARD,XQ(I)::S(H)
      • B(c);N_GUARD,P_SPINS(g)::R1(E),XB(c)
      • R(a);S_CUTB(c)::S(G)
      • B(c);P_SPINS(g),S_CUTR(a)::QAB(I)
      • S(g);N_SPINR(e),P_SPINB(c),S_CUTR(a)::S(G)
      • S(g);P_SPINB(c)::S(G)
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