MESON Chess Problem Database

Problem Display
PID: 28737 (7K/8/6Q1/8/R7/b7/2RP4/1k6 w - - 0 1)

Stocchi, Ottavio

Die Schwalbe, 1935

7K/8/6Q1/8/R7/b7/2RP4/1k6

#2

5 + 2

2012 Miniature Chess Problems from Many Countries 1981
3295 Einfuhrung in die Welt des Schachproblem 1984
3100 Selected Stocchi (I) 2001
14475 Mat Plus Review 2007
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Ka1
      • 2.Qg1#
    • 1...Bc1
      • 2.Rca2#
    • 1...Bb2+
      • 2.Rc3#
  • Tries
    • 1.Rc1+?
      • 1...Ka2
        • 2.Qb1#
        • 2.Qc2#
      • 1...Kb2
        • 2.Qb1#
        • 2.Qc2#
      • 1...Kxc1!
    • 1.Ra2+?
      • 1...Kc1
        • 2.Qc2#
        • 2.Qg1#
      • 1...Kxa2!
    • 1.Rb2+?
      • 1...Ka1
        • 2.Qb1#
      • 1...Kc1
        • 2.Qb1#
        • 2.Qc2#
      • 1...Kxb2!
    • 1.Qg1+?
      • 1...Bc1
        • 2.Qxc1#
      • 1...Kxc2!
  • Keys
    • 1.Qd3!
      • 1...Bb2+
        • 2.Rc3#
      • 1...Ka1
        • 2.Qf1#
      • 1...Bb4
        • 2.Qb3#
      • 1...Bc1
        • 2.Rca2#
      • 1...Bc5
        • 2.Qb3#
      • 1...Bd6
        • 2.Qb3#
      • 1...Be7
        • 2.Qb3#
      • 1...Bf8
        • 2.Qb3#

This anticipates 134461(1983), 22731(1987)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT,P_SPINB(b)::QAR(D)
    • B(b);SBLOCK::QAB(D)+R(A)
    • B(b);CHECK,SBLOCK::QAB(D)+R(A)
  • Tries
    • Try
      • R(A);CHECK
      • Refutation
        • K(a);P-FLIGHT,XR(A)
    • Try
      • R(A);CHECK
      • Refutation
        • K(a);P_SPINB(b),S_FLIGHT,XR(A)
    • Try
      • R(A);CHECK
      • Vars
        • K(a);P-FLIGHT,P_SPINB(b)::QAR1(D)
      • Refutation
        • K(a);P-FLIGHT,XR(A)
    • Try
      • Q(D);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAR1(D),XB(b)
      • Refutation
        • K(a);S_FLIGHT,XR(A)
  • Actual
    • Q(D);
    • Vars
      • B(b);CHECK,SBLOCK::QAB(D)+R(A)
      • K(a);P-FLIGHT,P_SPINB(b)::QAR(D)
      • B(b);N_GUARD::QAR2(D)
      • B(b);SBLOCK::QAB(D)+R(A)
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