MESON Chess Problem Database

Problem Display
PID: 10632 (3N1B2/4r2b/1n2PpBn/1N1k1q1Q/1P2RPp1/3K2P1/3b4/3R4 w - - 0 1)

Lender, Baruch

Postsjakk, 1966

3N1B2/4r2b/1n2PpBn/1N1k1q1Q/1P2RPp1/3K2P1/3b4/3R4

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Rd4#
    • 1...Qg5
      • 2.Rd4#
    • 1...Qxh5
      • 2.Rd4#
    • 1...Rxe6
      • 2.Sc7#
    • 1...Rc7
      • 2.Sxc7#
    • 1...Re8
      • 2.Sc7#
    • 1...Be3
      • 2.Kxe3#
    • 1...Sg8
      • 2.Qxf5#
  • Tries
    • 1.Kxd2?
      • threat
        • 2.Ke3#
        • 2.Rd4#
      • 1...Kxe4
        • 2.Qh1#
      • 1...Sc4+!
    • 1.Bxe7?
      • threat
        • 2.Sc7#
      • 1...Bxf4
        • 2.Sc3#
      • 1...Sa8!
  • Keys
    • 1.Ke2!
      • threat
        • 2.Rd4#
      • 1...Kxe4
        • 2.Qh1#
      • 1...Rxe6
        • 2.Sc3#
      • 1...Qe5
        • 2.Rxd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(d);N_PINR(E)::R1(E)
    • Q(d);N_PINR(E),N_SPINQ(d),XQ(H)::R1(E)
    • R(h);N_GUARD,XP(I)::S(G)
    • R(h);N_GUARD::S(G),XR(h)
    • R(h);N_GUARD::S(G)
    • B(a);::R(A)+K(B),XB(a)
    • S(g);N_GUARD::QAR2(H),XQ(d)
  • Tries
    • Try
      • K(B);N_SPINR(E),P-FLIGHT,XB(a)
      • Threat
        • DUALS(2)
      • Vars
        • K(c);OGATEB,S_FLIGHT,XR(E)::QAB(H)
      • Refutation
        • S(e);CHECK
    • Try
      • B(L);XR(h)
      • Threat
        • S(G)
      • Vars
        • B(a);N_GUARD,XP(F)::S(G)
      • Refutation
        • S(e);
  • Actual
    • K(B);N_SPINR(E),P_PINB(a),S_FLIGHT
    • Threat
      • R1(E)
    • Vars
      • K(c);N_SPINB(a),OGATEB,S_FLIGHT,XR(E)::QAB(H)
      • R(h);P_PINR(E),XP(I)::S(G)
      • Q(d);P_PINR(E)::R(A),XB(a)
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