MESON Chess Problem Database

Problem Display
PID: 12134 (8/2p1p2n/2pb1B2/R1Nkr3/1Pp1N1Q1/1p1bK3/8/2nR3B w - - 0 1)

Lender, Baruch

4th Prize, Makuc/Moder MT, 1975-1976

8/2p1p2n/2pb1B2/R1Nkr3/1Pp1N1Q1/1p1bK3/8/2nR3B

#2

9 + 11

3841 The Art of Israeli Chess Composition 1983
56 The Problemist 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe4+
      • 2.Bxe4#
      • 2.Qxe4#
    • 1...Rf5
      • 2.Sc3#
    • 1...Rg5
      • 2.Sf2#
      • 2.Sc3#
      • 2.Sg3#
      • 2.Sxg5#
      • 2.Qe6#
    • 1...Rh5
      • 2.Sc3#
      • 2.Qe6#
    • 1...Re6
      • 2.Qxe6#
    • 1...Bxc5+
      • 2.Rxc5#
  • Tries
    • 1.Sxb3+?
      • 1...Bc5+
        • 2.Rxc5#
      • 1...c5!
    • 1.Sxd3+?
      • 1...Bc5+
        • 2.Rxc5#
      • 1...c5!
    • 1.Sa4+?
      • 1...Bc5+
        • 2.Rxc5#
      • 1...c5!
    • 1.Sa6+?
      • 1...Bc5+
        • 2.Rxc5#
      • 1...c5!
    • 1.Se6+?
      • 1...Bc5+
        • 2.Rxc5#
      • 1...c5!
    • 1.Sb7+?
      • 1...Bc5+
        • 2.Rxc5#
      • 1...c5!
    • 1.Sd7+?
      • 1...Bc5+
        • 2.Rxc5#
      • 1...c5!
    • 1.Qg8+?
      • 1...Re6
        • 2.Qxe6#
      • 1...e6!
  • Keys
    • 1.Kd2!
      • threat
        • 2.Sc3#
      • 1...c3+
        • 2.Sxc3#
      • 1...Kd4
        • 2.Se6#
      • 1...Rxe4
        • 2.Qe6#
      • 1...Bxe4
        • 2.Kxc1#
      • 1...Bxc5
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(f);N_PINS(E)::B(B)+S(E),DCHECK
    • R(f);N_GUARD::QAB1(F),XR(f)
    • B(h);CHECK,OGATE,XS(H)::R1(G),XB(h)
  • Tries
    • Try
      • S(H);CHECK,XP(b)
      • Vars
        • B(h);CHECK,N_GUARD::R1(G),XB(h)
      • Refutation
        • P(g);P_SPINP(g)
    • Try
      • S(H);CHECK,XB(c)
      • Vars
        • B(h);CHECK,N_GUARD,P_SPINB(h)::R1(G),XB(h)
      • Refutation
        • P(g);P_SPINP(g)
    • Try
      • S(H);CHECK
      • Vars
        • B(h);CHECK,N_GUARD::R1(G),XB(h)
      • Refutation
        • P(g);P_SPINP(g)
    • Try
      • S(H);CHECK
      • Vars
        • B(h);CHECK,N_GUARD::R1(G),XB(h)
      • Refutation
        • P(g);P_SPINP(g)
    • Try
      • S(H);CHECK
      • Vars
        • B(h);CHECK,N_GUARD::R1(G),XB(h)
      • Refutation
        • P(g);P_SPINP(g)
    • Try
      • S(H);CHECK
      • Vars
        • B(h);CHECK,N_GUARD::R1(G),XB(h)
      • Refutation
        • P(g);P_SPINP(g)
    • Try
      • S(H);CHECK
      • Vars
        • B(h);CHECK,N_GUARD::R1(G),XB(h)
      • Refutation
        • P(g);P_SPINP(g)
    • Try
      • Q(F);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAB1(F),XR(f)
      • Refutation
        • P(j);P_SPINP(j)
  • Actual
    • K(C);N_PINB(c),N_SPINS(E),S_FLIGHT
    • Threat
      • B(B)+S(E),DCHECK
    • Vars
      • P(d);CHECK::B(B)+S(E),DCHECK,XP(d)
      • K(e);P-FLIGHT,P_SPINR(f)::S(H)
      • R(f);N_GUARD,P_SPINR(f),XS(E)::QAB1(F)
      • B(c);P_SPINB(c),XS(E)::R(A)+K(C),XS(a)
      • B(h);OGATEB,P_SPINB(h),XS(H)::QAR2(F)
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