MESON Chess Problem Database

Problem Display
PID: 107972 (8/8/3p1nrn/1p1Bk2N/1P6/p2KNQb1/1r1P4/B7 w - - 0 1)

Lepage, Roger

di Scala, Pascal

Northwest Chess, 1974

8/8/3p1nrn/1p1Bk2N/1P6/p2KNQb1/1r1P4/B7

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rg4
      • 2.Qxf6#
    • 1...Rg5
      • 2.Qxf6#
    • 1...Rg7
      • 2.Qxf6#
    • 1...Rg8
      • 2.Qxf6#
    • 1...Be1
      • 2.Qf4#
    • 1...Bf2
      • 2.Qf4#
    • 1...Bf4
      • 2.Qxf4#
    • 1...Bh4
      • 2.Qf4#
    • 1...Se4
      • 2.Qxe4#
    • 1...Sfg4
      • 2.Qe4#
      • 2.Qxg3#
    • 1...Sxd5
      • 2.Qe4#
      • 2.Qxd5#
    • 1...Sd7
      • 2.Qe4#
    • 1...Sh7
      • 2.Qe4#
    • 1...Se8
      • 2.Qe4#
    • 1...Sfg8
      • 2.Qe4#
    • 1...Shg4
      • 2.Qxg3#
      • 2.Qf5#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sf7
      • 2.Qf5#
    • 1...Shg8
      • 2.Qf5#
    • 1...a2
      • 2.Bxb2#
  • Tries
    • 1.Sxf6?
      • threat
        • 2.Sd7#
      • 1...Rxf6
        • 2.Qe4#
      • 1...Rg7!
  • Keys
    • 1.Kc3!
      • threat
        • 2.d4#
      • 1...Rc2+
        • 2.Kxc2#
      • 1...Rb3+
        • 2.Kxb3#
      • 1...Se4+
        • 2.Qxe4#
      • 1...Sxd5+
        • 2.Qxd5#
      • 1...Rxd2
        • 2.Kxd2#
      • 1...Rxb4
        • 2.Kxb4#
      • 1...Rg4
        • 2.Qxf6#
      • 1...Be1
        • 2.Qf4#
      • 1...Sf5
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 13
  • Sets
    • R(h);N_GUARD::QAB1(E),XS(g)
    • B(c);N_GUARD::QAB1(E)
    • B(c);N_GUARD::QAB1(E),XB(c)
    • S(g);N_GUARD::QAR1(E),XS(g)
    • S(g);N_GUARD::QAR1(E)
    • S(i);N_GUARD::QAR1(E),XS(i)
    • S(i);N_GUARD::QAR1(E)
    • P(b);N_GUARD::B(A),XR(a)
  • Tries
    • Try
      • S(H);XS(g)
      • Threat
        • S(H)
      • Vars
        • R(h);SBLOCK,XS(H)::QAR1(E)
      • Refutation
        • R(h);
  • Actual
    • K(C);N_PINR(a),P-FLIGHT
    • Threat
      • P(B)
    • Vars
      • R(a);CHECK::B(A)+K(C),XR(a)
      • S(g);CHECK,N_GUARD::QAR1(E),XS(g)
      • S(g);CHECK,OGATE,XB(G)::QAR1(E),XS(g)
      • R(a);XP(B)::B(A)+K(C),XR(a)
      • R(a);XP(F)::B(A)+K(C),XR(a)
      • R(h);N_GUARD::QAB1(E),XS(g)
      • B(c);N_GUARD,P_PINP(B)::QAB1(E)
      • S(i);N_GUARD::QAR1(E),XS(i)
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