MESON Chess Problem Database

Problem Display
PID: 179942 (1N2b2K/1R6/8/knr3R1/qN1Q4/6B1/8/8 w - - 0 1)

Gross, Erwin

Die Schwalbe, 1984

1N2b2K/1R6/8/knr3R1/qN1Q4/6B1/8/8

#2

7 + 5

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rc1
      • 2.Ra7#
    • 1...Rc2
      • 2.Ra7#
    • 1...Rc3
      • 2.Ra7#
    • 1...Rc7
      • 2.Bxc7#
    • 1...Rc8
      • 2.Ra7#
    • 1...Sa3
      • 2.Bc7#
      • 2.Qd8#
    • 1...Sc3
      • 2.Bc7#
      • 2.Qd8#
    • 1...Sxd4
      • 2.Bc7#
    • 1...Sa7
      • 2.Bc7#
      • 2.Qd8#
    • 1...Sc7
      • 2.Bxc7#
  • Tries
    • 1.Ra7+?
      • 1...Kb6
        • 2.Qxc5#
      • 1...Sxa7!
    • 1.Qxc5?
      • threat
        • 2.Bc7#
        • 2.Ra7#
      • 1...Qxb4
        • 2.Ra7#
        • 2.Qa7#
      • 1...Qd1
        • 2.Ra7#
      • 1...Qc2
        • 2.Ra7#
      • 1...Qb3
        • 2.Ra7#
      • 1...Qa2
        • 2.Ra7#
      • 1...Qa3
        • 2.Ra7#
      • 1...Qa1+!
  • Keys
    • 1.Be1!
      • threat
        • 2.S4c6#
      • 1...Qxb4
        • 2.Qxb4#
      • 1...Rc3
        • 2.Ra7#
      • 1...Rc6
        • 2.S4xc6#
      • 1...Bc6
        • 2.S4xc6#
      • 1...Sc3
        • 2.Qd8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • R(d);P_SPINS(c)::R(E)
    • R(d);N_GUARD,P_SPINS(c)::B(A),XR(d)
    • S(c);N_GUARD,P_SPINR(d),XQ(C)::B(A)
    • S(c);N_GUARD,P_SPINR(d)::B(A),XS(c)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • K(b);P_SPINR(d),S_FLIGHT::QAB1(C),XR(d)
      • Refutation
        • S(c);P_SPINR(d),XR(E)
    • Try
      • Q(C);P_PINS(c),XR(d)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);::R(E)
      • Refutation
        • Q(a);CHECK
  • Actual
    • B(A);
    • Threat
      • B(A)+S(B),DCHECK
    • Vars
      • Q(a);OGATE,P_SPINQ(a),XS(B)::QAB1(C),XQ(a)
      • R(d);P_SPINS(c)::R(E)
      • R(d);P_SPINS(c)::B(A)+S(B),DCHECK,XR(d)
      • B(e);::B(A)+S(B),DCHECK,XB(e)
      • S(c);N_GUARD,P_SPINR(d)::QAB(C)
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