MESON Chess Problem Database

Problem Display
PID: 101352 (4R3/8/7K/8/5NQ1/8/R2pp3/2BkN3 w - - 0 1)

Hartong, Jan

Good Companions, 1920

4R3/8/7K/8/5NQ1/8/R2pp3/2BkN3

#2

7 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe1
      • 2.Qxe2#
      • 2.Qg1#
    • 1...dxc1Q
      • 2.Qxe2#
    • 1...dxc1B
      • 2.Qxe2#
    • 1...dxc1R
      • 2.Qxe2#
  • Tries
    • 1.Sed3?
      • threat
        • 2.Rxd2#
        • 2.Qxe2#
      • 1...dxc1Q
        • 2.Qxe2#
      • 1...dxc1B
        • 2.Qxe2#
      • 1...dxc1R
        • 2.Qxe2#
      • 1...dxc1S!
    • 1.Ba3?
      • threat
        • 2.Ra1#
        • 2.Qxe2#
      • 1...Kxe1
        • 2.Qxe2#
        • 2.Qg1#
      • 1...dxe1S
        • 2.Qxe2#
      • 1...dxe1B
        • 2.Qxe2#
      • 1...dxe1R
        • 2.Rd8#
        • 2.Qd7#
      • 1...dxe1Q!
    • 1.Rxd2+?
      • 1...Kxe1
        • 2.Qxe2#
        • 2.Qg1#
      • 1...Kxc1!
    • 1.Rd8?
      • 1...Kxe1
        • 2.Qxe2#
        • 2.Qg1#
      • 1...Kxc1!
  • Keys
    • 1.Sxe2!
      • 1...dxc1Q+
        • 2.Sf4#
      • 1...dxc1B+
        • 2.Sf4#
      • 1...Kxe1
        • 2.Qg1#
      • 1...dxc1S
        • 2.Sc3#
      • 1...dxc1R
        • 2.Sg1#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sd4#
        • 2.Sf4#
      • 1...dxe1Q
        • 2.Qa4#
      • 1...dxe1S
        • 2.Rd2#
      • 1...dxe1B
        • 2.Qa4#
      • 1...dxe1R
        • 2.Rd2#
        • 2.Rd8#
        • 2.Qd7#
        • 2.Qa4#
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • P(b);P_PINS(D),SBLOCK,XB(A)::QAB1(E),XP(c)
    • P(b);SBLOCK,XB(A)::QAB1(E),XP(c)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);P_PINS(D),XB(A)::QAB1(E),XP(c)
        • P(b);XB(A)::QAB1(E),XP(c)
      • Refutation
        • P(b);XB(A)
    • Try
      • B(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);XS(B)::QAB1(E),XP(c)
      • Refutation
        • P(b);XS(B)
    • Try
      • R(C);CHECK,XP(b)
      • Refutation
        • K(a);N_SPINP(c),P-FLIGHT,XB(A)
    • Try
      • R(G);N_PINP(c),P_PINP(b)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT,XB(A)
  • Actual
    • S(D);XP(c)
    • Vars
      • P(b);CHECK,SBLOCK,XB(A)::QAB(E)+S(D)
      • K(a);OGATEB,P-FLIGHT,XS(B)::QAR2(E)
      • P(b);SBLOCK,XB(A)::QAB(E)+S(D),DCHECK
      • P(b);SBLOCK,XS(B)::QAB(E)
      • P(b);SBLOCK,XS(B)::R1(C)
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