MESON Chess Problem Database

Problem Display
PID: 238660 (b2r3q/8/2n4b/2P2Q2/KPk3BR/1Npp4/1P2n3/2R1r3 w - - 0 1)

Horstmann, Bernd

Die Schwalbe, 1970

b2r3q/8/2n4b/2P2Q2/KPk3BR/1Npp4/1P2n3/2R1r3

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rb8
      • 2.Qe6#
      • 2.Qf7#
    • 1...Rc8
      • 2.Qe6#
      • 2.Qf7#
    • 1...Rf8
      • 2.Qe6#
    • 1...Rg8
      • 2.Qe6#
      • 2.Qf7#
    • 1...Sed4
      • 2.Rxc3#
    • 1...Scd4
      • 2.Sa5#
    • 1...d2
      • 2.Bxe2#
  • Tries
    • 1.Sd2+?
      • 1...Kd4
        • 2.Qe4#
      • 1...Bxd2!
    • 1.Bxe2+?
      • 1...Qd4
        • 2.Bxd3#
        • 2.Rxc3#
      • 1...Rd4
        • 2.Bxd3#
        • 2.Rxc3#
        • 2.Qe6#
        • 2.Qf7#
      • 1...Sd4
        • 2.Sa5#
        • 2.Bxd3#
        • 2.Rxc3#
      • 1...Bf4!
    • 1.Qxd3+?
      • 1...Rxd3
        • 2.Be6#
      • 1...Kxd3!
    • 1.Qe4+?
      • 1...Rd4
        • 2.Be6#
      • 1...Sed4
        • 2.Rxc3#
      • 1...Scd4
        • 2.Sa5#
      • 1...Qd4!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Be6#
      • 1...Sed4
        • 2.Rxc3#
      • 1...Sf4
        • 2.Sd2#
      • 1...Scd4
        • 2.Sa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(i);N_GUARD::QAB(I)
    • S(b);N_GUARD,S_CUTQ(j)::R1(A),XP(c)
    • S(f);N_GUARD,SBLOCK::S(C)
    • P(d);::R(G)+B(F),DCHECK,XS(b)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(e);N_SPINP(c),P-FLIGHT::QAR1(I)
      • Refutation
        • B(g);XS(C)
    • Try
      • B(F);CHECK,XS(b)
      • Refutation
        • B(g);P_SPINB(g)
    • Try
      • Q(I);CHECK,XP(d)
      • Vars
        • R(i);SBLOCK,XQ(I)::R(G)+B(F),DCHECK
      • Refutation
        • K(e);N_SPINP(c),S_FLIGHT,XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • R(i);P_SPINR(i)::B(F)
        • S(b);P_SPINS(b)::R1(A),XP(c)
        • S(f);P_SPINS(f)::S(C)
      • Refutation
        • Q(j);P_SPINQ(j)
  • Actual
    • Q(I);
    • Threat
      • R(G)+B(F),DCHECK
    • Vars
      • S(b);N_GUARD,S_CUTQ(j)::R1(A),XP(c)
      • S(b);S_CUTB(g)::S(C)
      • S(f);N_GUARD::S(C)
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