MESON Chess Problem Database

Problem Display
PID: 207707 (4r2B/pQ6/KR1Pk1Pn/2pr1pPN/2B5/1N5n/3pb3/4Rqb1 w - - 0 1)

Lebedev, Alexey Nikolaevich

Il Problema, 1933

4r2B/pQ6/KR1Pk1Pn/2pr1pPN/2B5/1N5n/3pb3/4Rqb1

#2

11 + 12

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Re7
      • 2.Qxe7#
    • 1...Ra8
      • 2.Qe7#
    • 1...Rb8
      • 2.Qe7#
    • 1...Rc8
      • 2.Qxc8#
      • 2.Qe7#
    • 1...Rd8
      • 2.Qe7#
    • 1...Rf8
      • 2.Qe7#
    • 1...Rg8
      • 2.Qe7#
    • 1...Rxh8
      • 2.Qe7#
    • 1...Bh2
      • 2.Sxc5#
    • 1...Sf2
      • 2.Sxc5#
      • 2.Sf4#
    • 1...Sg4
      • 2.Qf7#
    • 1...Sf7
      • 2.Qxf7#
    • 1...Sg8
      • 2.Qf7#
  • Tries
    • 1.Rxe2+?
      • 1...Be3
        • 2.Sxc5#
        • 2.Bxd5#
        • 2.Rxe3#
      • 1...Qxe2!
  • Keys
    • 1.Bb5!
      • threat
        • 2.Qd7#
      • 1...Rxd6
        • 2.Bc4#
      • 1...Rxh8
        • 2.Qe7#
      • 1...Rd3
        • 2.Bd7#
      • 1...Rd4
        • 2.Sxc5#
      • 1...Re5
        • 2.Sg7#
      • 1...Re7
        • 2.Qxe7#
      • 1...Rd8
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • R(l);N_GUARD::QAR1(J),XR(l)
    • R(l);N_GUARD::QAR1(J)
    • R(l);N_GUARD,XB(K)::QAR1(J)
    • B(b);N_GUARD::S(B),XP(f)
    • S(j);N_GUARD::QAB1(J)
    • S(j);N_GUARD::QAB1(J),XS(j)
  • Tries
    • Try
      • R(A);CHECK,N_SPINB(C),XB(d)
      • Refutation
        • Q(a);P_PINB(C),XR(A)
  • Actual
    • B(C);N_PINR(g)
    • Threat
      • QAB1(J)
    • Vars
      • R(g);P_PINR(G),P_SPINR(g),XP(H)::B(C)
      • R(l);N_GUARD,XB(K)::QAR1(J)
      • R(g);N_PINB(C)::B(C)
      • R(g);N_GUARD,S_CUTB(b)::S(B),XP(f)
      • R(g);N_SPINB(d),SBLOCK::S(E)
      • R(l);N_GUARD::QAR1(J),XR(l)
      • R(l);N_GUARD::QAR1(J)
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