MESON Chess Problem Database

Problem Display
PID: 100903 (bb6/2pp4/5p2/2RP1k2/2p2rR1/1p5P/4Q2B/3N3K w - - 0 1)

Dobbs, Gilbert S

Good Companions, 1920

bb6/2pp4/5p2/2RP1k2/2p2rR1/1p5P/4Q2B/3N3K

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rf1+
      • 2.Qxf1#
    • 1...Rf2
      • 2.Se3#
      • 2.Qxf2#
      • 2.Qe4#
    • 1...Rf3
      • 2.Qxf3#
      • 2.Qe4#
    • 1...Rd4
      • 2.Se3#
    • 1...Re4
      • 2.Qxe4#
    • 1...Rxg4
      • 2.Qxg4#
    • 1...Bxd5+
      • 2.Rxd5#
    • 1...c6
      • 2.d6#
    • 1...d6
      • 2.Qe6#
  • Tries
    • 1.Qd3+?
      • 1...Ke5
        • 2.Bxf4#
      • 1...Re4
        • 2.Se3#
        • 2.Qxe4#
      • 1...cxd3!
  • Keys
    • 1.Qxc4!
      • threat
        • 2.Qxf4#
      • 1...Rf1+
        • 2.Qxf1#
      • 1...Bxd5+
        • 2.Qxd5#
      • 1...Ke5
        • 2.Qxf4#
      • 1...Rxc4
        • 2.Se3#
      • 1...Rxg4
        • 2.Qxg4#
      • 1...Rf2
        • 2.Se3#
        • 2.Qd3#
        • 2.Qe4#
      • 1...Rf3
        • 2.Qe4#
      • 1...Rd4
        • 2.Se3#
      • 1...Re4
        • 2.Qxe4#
      • 1...c6
        • 2.d6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(c);CHECK,OGATEB::QAR(C),XR(c)
    • R(c);::S(A)
    • R(c);N_GUARD,N_PINP(H)::QAB1(C),XR(c)
    • R(c);OGATE,XR(F)::QAB1(C),XR(c)
    • B(h);CHECK,OGATE,P_SPINB(h),XP(H)::R(G),XB(h)
    • P(f);N_PINP(H)::R(G)+P(H)
    • P(g);N_GUARD::QAB1(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);P-FLIGHT,P_SPINR(c)::B(D),XR(c)
      • Refutation
        • P(b);XQ(C)
  • Actual
    • Q(C);XP(b)
    • Threat
      • QAR1(C),XR(c)
    • Vars
      • R(c);CHECK,OGATEB::QAR(C),XR(c)
      • B(h);CHECK,OGATE,P_SPINB(h),XP(H)::QAR2(C),XB(h)
      • K(d);P-FLIGHT,P_SPINR(c)::QAB1(C),XR(c)
      • R(c);XQ(C)::S(A)
      • R(c);OGATE,XR(F)::QAB1(C),XR(c)
      • R(c);N_GUARD,N_PINP(H)::QAB1(C)
      • R(c);::S(A)
      • R(c);N_GUARD,N_PINP(H)::QAB1(C),XR(c)
      • P(f);N_PINP(H)::R(G)+P(H)
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