MESON Chess Problem Database

Problem Display
PID: 78914 (4B3/pP1N4/pP6/k1p1R3/1b6/P1N5/3Q4/R3K3 w Q - 0 1)

Lange, Hans Franz

Die Schwalbe, 1939

4B3/pP1N4/pP6/k1p1R3/1b6/P1N5/3Q4/R3K3

#2

10 + 5

SOLUTION

  • SOUND
  • Tries
    • 1.Qf4?
      • threat
        • 2.Qxb4#
        • 2.axb4#
      • 1...Bxa3
        • 2.Rxa3#
        • 2.Rxc5#
        • 2.Qa4#
      • 1...Bxc3+!
    • 1.Qb2?
      • threat
        • 2.Qxb4#
        • 2.axb4#
      • 1...Bxa3
        • 2.Rxa3#
        • 2.Rxc5#
        • 2.Qxa3#
      • 1...Bxc3+!
    • 1.Qd4?
      • threat
        • 2.Qxb4#
        • 2.axb4#
      • 1...Bxa3
        • 2.Rxa3#
        • 2.Rxc5#
        • 2.Qxc5#
        • 2.Qa4#
      • 1...Bxc3+!
    • 1.Qd6?
      • 1...Bxa3
        • 2.Qxc5#
      • 1...axb6
        • 2.Qxb6#
      • 1...Bxc3+!
  • Keys
    • 1.Sxc5!
      • 1...Kxb6
        • 2.Qd8#
      • 1...Bxa3
        • 2.Sd5#
      • 1...Bxc3
        • 2.Sa4#
      • 1...Bxc5
        • 2.Sa4#
      • 1...axb6
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);P_SPINS(E)
      • Threat
        • DUALS(2)
      • Refutation
        • B(a);CHECK,XS(E)
    • Try
      • Q(C);P_SPINS(E)
      • Threat
        • DUALS(2)
      • Refutation
        • B(a);CHECK,XS(E)
    • Try
      • Q(C);P_SPINS(E)
      • Threat
        • DUALS(2)
      • Refutation
        • B(a);CHECK,XS(E)
    • Try
      • Q(C);P_SPINS(E)
      • Vars
        • B(a);N_GUARD,N_PINS(E),P_SPINB(a),XP(D)::QAR2(C),XP(c)
        • P(e);OGATE,XP(G)::QAB1(C),XP(e)
      • Refutation
        • B(a);CHECK,XS(E)
  • Actual
    • S(I);XP(c)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XP(G)::QAB(C)
      • B(a);P_SPINB(a),XP(D)::QAB(C)+S(E)
      • B(a);N_GUARD,P_PINQ(C),P_SPINB(a),XS(E)::R(F)+S(I)
      • B(a);P_SPINB(a),XS(I)::QAB(C)+S(E)
      • P(e);SBLOCK,XP(G)::R(F)+S(I),DCHECK
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