MESON Chess Problem Database

Problem Display
PID: 146282 (2RN1Q2/rp4Kp/1B2p2P/rn2k3/2P2N2/3B1Pp1/3qn3/bR6 w - - 0 1)

Janet, Frank

American Chess Problemist, 1950

2RN1Q2/rp4Kp/1B2p2P/rn2k3/2P2N2/3B1Pp1/3qn3/bR6

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf4
      • 2.Qc5#
    • 1...Qxd3
      • 2.Sxd3#
    • 1...Ra2
      • 2.Rxb5#
    • 1...Ra3
      • 2.Rxb5#
    • 1...Ra4
      • 2.Rxb5#
    • 1...R5a6
      • 2.Rxb5#
    • 1...Sed4
      • 2.Rc5#
    • 1...Sxf4
      • 2.Sf7#
    • 1...Sbd4
      • 2.Bc7#
    • 1...Sd6
      • 2.Qf6#
  • Tries
    • 1.Sxb7?
      • threat
        • 2.Qf6#
      • 1...Qxf4
        • 2.Qc5#
      • 1...Rxb7+!
    • 1.Rc6?
      • threat
        • 2.Rxe6#
        • 2.Qf6#
      • 1...Qxf4
        • 2.Rxe6#
        • 2.Qc5#
      • 1...Sxf4
        • 2.Sf7#
        • 2.Qf6#
      • 1...Sed4
        • 2.Rc5#
        • 2.Qf6#
      • 1...Sbd4
        • 2.Bc7#
        • 2.Qd6#
        • 2.Qf6#
      • 1...Sd6
        • 2.Qxd6#
        • 2.Qf6#
      • 1...Sc7
        • 2.Qd6#
        • 2.Qf6#
      • 1...bxc6+!
  • Keys
    • 1.Rh1!
      • threat
        • 2.Rh5#
      • 1...Qxf4
        • 2.Qc5#
      • 1...Qxd3
        • 2.Sxd3#
      • 1...Sxf4
        • 2.Sf7#
      • 1...Sed4
        • 2.Rc5#
      • 1...Sbd4
        • 2.Bc7#
      • 1...Sd6
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • Q(b);SBLOCK,XS(E)::QAR2(K)
    • Q(b);XB(B)::S(E),XQ(b)
    • R(e);N_GUARD::R(A),XS(f)
    • S(c);SBLOCK::R(I)
    • S(c);SBLOCK,XS(E)::S(J)
    • S(f);N_GUARD,SBLOCK::B(F)
    • S(f);SBLOCK::QAB1(K)
  • Tries
    • Try
      • S(J);P_SPINS(J),XP(j)
      • Threat
        • QAB1(K)
      • Vars
        • Q(b);SBLOCK,XS(E)::QAR2(K)
      • Refutation
        • R(i);CHECK,XS(J)
    • Try
      • R(I);
      • Threat
        • DUALS(2)
      • Refutation
        • P(j);CHECK,XR(I)
  • Actual
    • R(A);
    • Threat
      • R(A)
    • Vars
      • Q(b);SBLOCK,XS(E)::QAR2(K)
      • Q(b);XB(B)::S(E),XQ(b)
      • S(c);SBLOCK,XS(E)::S(J)
      • S(c);SBLOCK::R(I)
      • S(f);N_GUARD,SBLOCK::B(F)
      • S(f);SBLOCK::QAB1(K)
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