MESON Chess Problem Database

Problem Display
PID: 271386 (8/5K2/2pB4/1b6/R1pk4/5P2/Q1R5/1n3B2 w - - 0 1)

Deser, KA

Die Schwalbe, 1932

8/5K2/2pB4/1b6/R1pk4/5P2/Q1R5/1n3B2

#2

7 + 5

SOLUTION

  • SOUND
  • Tries
    • 1.Rd2+?
      • 1...Kc3
        • 2.Bb4#
        • 2.Be5#
        • 2.Qb2#
        • 2.Qc2#
      • 1...Sxd2
        • 2.Qxd2#
      • 1...Ke3!
    • 1.Rcxc4+?
      • 1...Ke3
        • 2.Qe2#
      • 1...Kd5
        • 2.Rd4#
      • 1...Bxc4+!
    • 1.Qxc4+?
      • 1...Ke3
        • 2.Qe4#
        • 2.Qf4#
      • 1...Bxc4+!
    • 1.Qa3?
      • threat
        • 2.Qc5#
        • 2.Qd3#
      • 1...Kd5
        • 2.Qc5#
      • 1...Bxa4
        • 2.Qc5#
      • 1...Sc3
        • 2.Qc5#
      • 1...c5
        • 2.Qxc5#
        • 2.Qd3#
      • 1...Sxa3!
  • Keys
    • 1.Rc3!
      • threat
        • 2.Rd3#
      • 1...Kxc3
        • 2.Be5#
      • 1...Kd5
        • 2.Rd3#
      • 1...Bxa4
        • 2.Qxc4#
      • 1...Sxc3
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • S(a);OGATE,XR(C)::QAR2(B),XS(a)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT
    • Try
      • R(C);CHECK,XP(b)
      • Vars
        • K(c);N_GUARD,S_CUTB(d),S_FLIGHT::QAR1(B)
        • K(c);N_GUARD,P-FLIGHT::QAB(B)+R(C),DCHECK
      • Refutation
        • B(d);CHECK,P_SPINB(d),XR(C)
    • Try
      • Q(B);CHECK,XP(b)
      • Refutation
        • B(d);CHECK,P_SPINB(d),XQ(B)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(c);N_SPINP(b),P-FLIGHT::QAR1(B)
        • B(d);N_SPINP(b),XR(E)::QAB1(B)
        • S(a);::QAB1(B)
      • Refutation
        • S(a);XQ(B)
  • Actual
    • R(C);
    • Threat
      • R1(C)
    • Vars
      • K(c);N_GUARD,N_SPINP(b),S_FLIGHT,XR(C)::B(F)
      • K(c);P-FLIGHT::R(C)
      • B(d);N_GUARD,N_SPINP(b),XR(E)::QAR1(B),XP(b)
      • S(a);N_GUARD,XR(C)::QAR2(B)
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