MESON Chess Problem Database

Problem Display
PID: 134611 (8/8/3P4/1P6/1Qp5/p1N5/Rppk1P2/B1R1N2K w - - 0 1)

Bettmann, Henry Wald

The Theory of Pawn Promotion, 1912

8/8/3P4/1P6/1Qp5/p1N5/Rppk1P2/B1R1N2K

#2

10 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...bxa1Q
      • 2.Raxc2#
    • 1...bxa1S
      • 2.Rd1#
    • 1...bxa1B
      • 2.Rd1#
      • 2.Raxc2#
    • 1...bxa1R
      • 2.Raxc2#
    • 1...b1S
      • 2.Rd1#
      • 2.Raxc2#
    • 1...b1B
      • 2.Rd1#
    • 1...b1R
      • 2.Raxc2#
  • Tries
    • 1.Se4+?
      • 1...Ke2
        • 2.Qxc4#
      • 1...Kxc1!
    • 1.Rxb2?
      • threat
        • 2.Rd1#
        • 2.Rbxc2#
      • 1...Kxc1
        • 2.Rxc2#
      • 1...axb2!
    • 1.Qc5?
      • threat
        • 2.Qe3#
      • 1...Kxc1
        • 2.Qe3#
        • 2.Qg5#
      • 1...Kxc3!
  • Keys
    • 1.Qxc4!
      • 1...Kxc1
        • 2.Qf4#
      • 1...bxa1Q
        • 2.Raxc2#
      • 1...bxa1S
        • 2.Rd1#
      • 1...bxa1B
        • 2.Rd1#
        • 2.Raxc2#
      • 1...bxa1R
        • 2.Raxc2#
      • 1...bxc1Q
        • 2.Qe2#
      • 1...bxc1S
        • 2.Sf3#
      • 1...bxc1B
        • 2.Sf3#
        • 2.Qe2#
      • 1...bxc1R
        • 2.Qe2#
      • 1...b1Q
        • 2.Qf4#
      • 1...b1S
        • 2.Rd1#
        • 2.Raxc2#
        • 2.Qf4#
      • 1...b1B
        • 2.Rd1#
        • 2.Qf4#
      • 1...b1R
        • 2.Raxc2#
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • P(a);OGATE,P_SPINP(b),XB(A)::R1(E),XP(b)
    • P(a);P_SPINP(b),XB(A)::R1(B)
    • P(a);P_SPINP(b)::R1(B)
    • P(a);OGATE,P_SPINP(b)::R1(E),XP(b)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB(H),XP(e)
      • Refutation
        • K(c);S_FLIGHT,XR(B)
    • Try
      • R(E);P_PINP(b),XP(a)
      • Threat
        • DUALS(2)
      • Vars
        • K(c);N_SPINP(b),S_FLIGHT,XR(B)::R1(E),XP(b)
      • Refutation
        • P(d);N_SPINP(b),XR(E)
    • Try
      • Q(H);
      • Threat
        • QAB1(H)
      • Refutation
        • K(c);P_SPINP(a),S_FLIGHT,XS(G)
  • Actual
    • Q(H);XP(e)
    • Vars
      • K(c);S_FLIGHT,XR(B)::QAB(H)
      • P(a);OGATE,P_SPINP(b),XB(A)::R1(E),XP(b)
      • P(a);P_SPINP(b),XB(A)::R1(B)
      • P(a);P_PINS(C),P_SPINP(b),SBLOCK,XR(B)::QAR1(H)
      • P(a);P_SPINP(b),SBLOCK,XR(B)::S(C)
      • P(a);P_SPINP(b)::QAB(H)
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